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3(x-1)=7x-31
We move all terms to the left:
3(x-1)-(7x-31)=0
We multiply parentheses
3x-(7x-31)-3=0
We get rid of parentheses
3x-7x+31-3=0
We add all the numbers together, and all the variables
-4x+28=0
We move all terms containing x to the left, all other terms to the right
-4x=-28
x=-28/-4
x=+7
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