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2(3x+7)=21
We move all terms to the left:
2(3x+7)-(21)=0
We multiply parentheses
6x+14-21=0
We add all the numbers together, and all the variables
6x-7=0
We move all terms containing x to the left, all other terms to the right
6x=7
x=7/6
x=1+1/6
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