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5(2x-7)=21
We move all terms to the left:
5(2x-7)-(21)=0
We multiply parentheses
10x-35-21=0
We add all the numbers together, and all the variables
10x-56=0
We move all terms containing x to the left, all other terms to the right
10x=56
x=56/10
x=5+3/5
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