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4x=-40+15x-15
We move all terms to the left:
4x-(-40+15x-15)=0
We add all the numbers together, and all the variables
4x-(15x-55)=0
We get rid of parentheses
4x-15x+55=0
We add all the numbers together, and all the variables
-11x+55=0
We move all terms containing x to the left, all other terms to the right
-11x=-55
x=-55/-11
x=+5
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