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3x+1=x+87
We move all terms to the left:
3x+1-(x+87)=0
We get rid of parentheses
3x-x-87+1=0
We add all the numbers together, and all the variables
2x-86=0
We move all terms containing x to the left, all other terms to the right
2x=86
x=86/2
x=43
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