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X+4=8X-6=13X-21
We move all terms to the left:
X+4-(8X-6)=0
We get rid of parentheses
X-8X+6+4=0
We add all the numbers together, and all the variables
-7X+10=0
We move all terms containing X to the left, all other terms to the right
-7X=-10
X=-10/-7
X=1+3/7
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