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-86+4x=-3x+40
We move all terms to the left:
-86+4x-(-3x+40)=0
We get rid of parentheses
4x+3x-40-86=0
We add all the numbers together, and all the variables
7x-126=0
We move all terms containing x to the left, all other terms to the right
7x=126
x=126/7
x=18
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