-7(3+5x)=399? I'm confused please help me!
Please help me I am tired and I have sooo much homework! ):
-7(3 +5x) = 399
-21 - 35x = 399
-21 + 21 -35x = 399+ 21
-35x = 420
-35x/-35 = 420/-35
x = -12
Proof:
-7(3 + 5*(-12) = 399
-7( 3-60) = 399
-7(-57) = 399
399 = 399
Thanks you Kuai! (:
Of course, I'd be happy to help you solve this equation!
To begin, let's simplify the left side of the equation by using the distributive property to multiply -7 by each term inside the parentheses:
-7(3 + 5x) = -7*3 - 7*5x
This simplifies to:
-21 - 35x = 399
Now, let's isolate the variable, x. Begin by subtracting -21 from both sides of the equation:
-35x = 399 + 21
Simplifying this further:
-35x = 420
Next, we can solve for x by dividing both sides of the equation by -35:
x = 420/-35
Simplifying the right side of the equation:
x = -12
Therefore, the solution to the equation -7(3+5x) = 399 is x = -12.