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(68+x)+(76+x)=142
We move all terms to the left:
(68+x)+(76+x)-(142)=0
We add all the numbers together, and all the variables
(x+68)+(x+76)-142=0
We get rid of parentheses
x+x+68+76-142=0
We add all the numbers together, and all the variables
2x+2=0
We move all terms containing x to the left, all other terms to the right
2x=-2
x=-2/2
x=-1
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