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X+21=14X-4
We move all terms to the left:
X+21-(14X-4)=0
We get rid of parentheses
X-14X+4+21=0
We add all the numbers together, and all the variables
-13X+25=0
We move all terms containing X to the left, all other terms to the right
-13X=-25
X=-25/-13
X=1+12/13
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