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3x+71=7x-15
We move all terms to the left:
3x+71-(7x-15)=0
We get rid of parentheses
3x-7x+15+71=0
We add all the numbers together, and all the variables
-4x+86=0
We move all terms containing x to the left, all other terms to the right
-4x=-86
x=-86/-4
x=21+1/2
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