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2x-(4x-7)=21
We move all terms to the left:
2x-(4x-7)-(21)=0
We get rid of parentheses
2x-4x+7-21=0
We add all the numbers together, and all the variables
-2x-14=0
We move all terms containing x to the left, all other terms to the right
-2x=14
x=14/-2
x=-7
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