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15x-(4x-7)=51
We move all terms to the left:
15x-(4x-7)-(51)=0
We get rid of parentheses
15x-4x+7-51=0
We add all the numbers together, and all the variables
11x-44=0
We move all terms containing x to the left, all other terms to the right
11x=44
x=44/11
x=4
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