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10x+3=11x-9
We move all terms to the left:
10x+3-(11x-9)=0
We get rid of parentheses
10x-11x+9+3=0
We add all the numbers together, and all the variables
-1x+12=0
We move all terms containing x to the left, all other terms to the right
-x=-12
x=-12/-1
x=+12
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