1. x-3

7x-3x = 4 x -6 turns into +6 so 4x=12 x=3

2. 13=5-13+3x 13=-8 +3x 21 = 3x x=7
3. x+x+x+3x+2-6 = 31 6x -4 = 31 6x=35 = 5.83 (are you sure its 3 x's?)

5. 5-t-t=-1 5-2t=-1 -2t = -6 t= 3

1. To solve the equation x - 3 = 0, where x is a variable, you want to isolate the variable on one side of the equation. Here's how you can do it step by step:

Start with the equation: x - 3 = 0
First, add 3 to both sides of the equation to get the variable term alone: x - 3 + 3 = 0 + 3
This simplifies to: x = 3
So, the solution to the equation x - 3 = 0 is x = 3.

2. Let's solve the equation 13 = 5 - 13 + 3x step by step:

Start with the equation: 13 = 5 - 13 + 3x
Combine like terms: 13 = -8 + 3x
Next, subtract -8 from both sides of the equation to isolate the variable term: 13 - (-8) = 3x
Simplify the left side: 13 + 8 = 3x
This gives us: 21 = 3x
Finally, divide both sides of the equation by 3 to find the value of x: 21/3 = x
The solution is: x = 7.

3. The equation x + x + x + 3x + 2 - 6 = 31 can be solved as follows:

Combine like terms: 6x - 4 = 31
Next, add 4 to both sides of the equation to isolate the variable term: 6x - 4 + 4 = 31 + 4
This simplifies to: 6x = 35
Finally, divide both sides of the equation by 6 to find the value of x: 6x/6 = 35/6
The solution is: x = 35/6, which is approximately 5.83.

5. To solve the equation 5 - t - t = -1, you can follow these steps:

Start with the equation: 5 - t - t = -1
Combine like terms: 5 - 2t = -1
Next, subtract 5 from both sides of the equation to isolate the variable term: 5 - 2t - 5 = -1 - 5
This simplifies to: -2t = -6
Finally, divide both sides of the equation by -2 to find the value of t: -2t/-2 = -6/-2
The solution is: t = 3.