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8x-71=x+4
We move all terms to the left:
8x-71-(x+4)=0
We get rid of parentheses
8x-x-4-71=0
We add all the numbers together, and all the variables
7x-75=0
We move all terms containing x to the left, all other terms to the right
7x=75
x=75/7
x=10+5/7
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