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X+28=3X-20
We move all terms to the left:
X+28-(3X-20)=0
We get rid of parentheses
X-3X+20+28=0
We add all the numbers together, and all the variables
-2X+48=0
We move all terms containing X to the left, all other terms to the right
-2X=-48
X=-48/-2
X=+24
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