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5(2x+2)=21
We move all terms to the left:
5(2x+2)-(21)=0
We multiply parentheses
10x+10-21=0
We add all the numbers together, and all the variables
10x-11=0
We move all terms containing x to the left, all other terms to the right
10x=11
x=11/10
x=1+1/10
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