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X+2X+11=10X-8-9
We move all terms to the left:
X+2X+11-(10X-8-9)=0
We add all the numbers together, and all the variables
X+2X-(10X-17)+11=0
We add all the numbers together, and all the variables
3X-(10X-17)+11=0
We get rid of parentheses
3X-10X+17+11=0
We add all the numbers together, and all the variables
-7X+28=0
We move all terms containing X to the left, all other terms to the right
-7X=-28
X=-28/-7
X=+4
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