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7(-7+2x)=21
We move all terms to the left:
7(-7+2x)-(21)=0
We add all the numbers together, and all the variables
7(2x-7)-21=0
We multiply parentheses
14x-49-21=0
We add all the numbers together, and all the variables
14x-70=0
We move all terms containing x to the left, all other terms to the right
14x=70
x=70/14
x=5
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