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X-10+3X=2X+20
We move all terms to the left:
X-10+3X-(2X+20)=0
We add all the numbers together, and all the variables
4X-(2X+20)-10=0
We get rid of parentheses
4X-2X-20-10=0
We add all the numbers together, and all the variables
2X-30=0
We move all terms containing X to the left, all other terms to the right
2X=30
X=30/2
X=15
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