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2(7x-3)=6x+21
We move all terms to the left:
2(7x-3)-(6x+21)=0
We multiply parentheses
14x-(6x+21)-6=0
We get rid of parentheses
14x-6x-21-6=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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