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7(-7+5x)=266
We move all terms to the left:
7(-7+5x)-(266)=0
We add all the numbers together, and all the variables
7(5x-7)-266=0
We multiply parentheses
35x-49-266=0
We add all the numbers together, and all the variables
35x-315=0
We move all terms containing x to the left, all other terms to the right
35x=315
x=315/35
x=9
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