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(4x+68)-(15x-35)=-40
We move all terms to the left:
(4x+68)-(15x-35)-(-40)=0
We add all the numbers together, and all the variables
(4x+68)-(15x-35)+40=0
We get rid of parentheses
4x-15x+68+35+40=0
We add all the numbers together, and all the variables
-11x+143=0
We move all terms containing x to the left, all other terms to the right
-11x=-143
x=-143/-11
x=+13
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