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(6x+21)=51
We move all terms to the left:
(6x+21)-(51)=0
We get rid of parentheses
6x+21-51=0
We add all the numbers together, and all the variables
6x-30=0
We move all terms containing x to the left, all other terms to the right
6x=30
x=30/6
x=5
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