Solve fro x.

15x+4=21+2x

15x-2x=21-4

13x=17 Divide wit 13

x=17/13

15x+4=21+2x

Subtract 2x from each side.
13x+4=21
Subtract 4 from each side.
13x=17
Divide each side by 13.
x=17/13

To solve for x in the equation 15x + 4 = 21 + 2x, you need to isolate the variable x on one side of the equation. Here's the step-by-step process:

Step 1: Combine like terms
Add -2x to both sides of the equation to eliminate the variable term on the right side:
15x + 4 - 2x = 21 + 2x - 2x

Simplifying the equation gives you:
13x + 4 = 21

Step 2: Move the constant term to the other side of the equation
Subtract 4 from both sides of the equation to isolate the variable term:
13x + 4 - 4 = 21 - 4

Simplifying the equation gives you:
13x = 17

Step 3: Solve for x
To solve for x, divide both sides of the equation by 13:
(13x)/13 = 17/13

Simplifying the equation gives you:
x = 17/13

So the solution to the equation 15x + 4 = 21 + 2x is x = 17/13.