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11x-71=7x-31
We move all terms to the left:
11x-71-(7x-31)=0
We get rid of parentheses
11x-7x+31-71=0
We add all the numbers together, and all the variables
4x-40=0
We move all terms containing x to the left, all other terms to the right
4x=40
x=40/4
x=10
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