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4-2x=87-3x
We move all terms to the left:
4-2x-(87-3x)=0
We add all the numbers together, and all the variables
-2x-(-3x+87)+4=0
We get rid of parentheses
-2x+3x-87+4=0
We add all the numbers together, and all the variables
x-83=0
We move all terms containing x to the left, all other terms to the right
x=83
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