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X+12=3X+10X-20
We move all terms to the left:
X+12-(3X+10X-20)=0
We add all the numbers together, and all the variables
X-(13X-20)+12=0
We get rid of parentheses
X-13X+20+12=0
We add all the numbers together, and all the variables
-12X+32=0
We move all terms containing X to the left, all other terms to the right
-12X=-32
X=-32/-12
X=2+2/3
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