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4(-4+5x)=124
We move all terms to the left:
4(-4+5x)-(124)=0
We add all the numbers together, and all the variables
4(5x-4)-124=0
We multiply parentheses
20x-16-124=0
We add all the numbers together, and all the variables
20x-140=0
We move all terms containing x to the left, all other terms to the right
20x=140
x=140/20
x=7
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