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4(7x-31)=72
We move all terms to the left:
4(7x-31)-(72)=0
We multiply parentheses
28x-124-72=0
We add all the numbers together, and all the variables
28x-196=0
We move all terms containing x to the left, all other terms to the right
28x=196
x=196/28
x=7
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