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8x+3(2x+1)=31
We move all terms to the left:
8x+3(2x+1)-(31)=0
We multiply parentheses
8x+6x+3-31=0
We add all the numbers together, and all the variables
14x-28=0
We move all terms containing x to the left, all other terms to the right
14x=28
x=28/14
x=2
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