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4x+3(x+8)=31
We move all terms to the left:
4x+3(x+8)-(31)=0
We multiply parentheses
4x+3x+24-31=0
We add all the numbers together, and all the variables
7x-7=0
We move all terms containing x to the left, all other terms to the right
7x=7
x=7/7
x=1
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