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10x-2(x+3)=21
We move all terms to the left:
10x-2(x+3)-(21)=0
We multiply parentheses
10x-2x-6-21=0
We add all the numbers together, and all the variables
8x-27=0
We move all terms containing x to the left, all other terms to the right
8x=27
x=27/8
x=3+3/8
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