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