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X=21X-4+80
We move all terms to the left:
X-(21X-4+80)=0
We add all the numbers together, and all the variables
X-(21X+76)=0
We get rid of parentheses
X-21X-76=0
We add all the numbers together, and all the variables
-20X-76=0
We move all terms containing X to the left, all other terms to the right
-20X=76
X=76/-20
X=-3+4/5
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