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X+3+5=2X-4
We move all terms to the left:
X+3+5-(2X-4)=0
We add all the numbers together, and all the variables
X-(2X-4)+8=0
We get rid of parentheses
X-2X+4+8=0
We add all the numbers together, and all the variables
-1X+12=0
We move all terms containing X to the left, all other terms to the right
-X=-12
X=-12/-1
X=+12
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