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14x-(6x-5)=21
We move all terms to the left:
14x-(6x-5)-(21)=0
We get rid of parentheses
14x-6x+5-21=0
We add all the numbers together, and all the variables
8x-16=0
We move all terms containing x to the left, all other terms to the right
8x=16
x=16/8
x=2
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