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x+6(x-3)=31
We move all terms to the left:
x+6(x-3)-(31)=0
We multiply parentheses
x+6x-18-31=0
We add all the numbers together, and all the variables
7x-49=0
We move all terms containing x to the left, all other terms to the right
7x=49
x=49/7
x=7
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