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3X-21+11=5X+10
We move all terms to the left:
3X-21+11-(5X+10)=0
We add all the numbers together, and all the variables
3X-(5X+10)-10=0
We get rid of parentheses
3X-5X-10-10=0
We add all the numbers together, and all the variables
-2X-20=0
We move all terms containing X to the left, all other terms to the right
-2X=20
X=20/-2
X=-10
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