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10x=9+12x
We move all terms to the left:
10x-(9+12x)=0
We add all the numbers together, and all the variables
10x-(12x+9)=0
We get rid of parentheses
10x-12x-9=0
We add all the numbers together, and all the variables
-2x-9=0
We move all terms containing x to the left, all other terms to the right
-2x=9
x=9/-2
x=-4+1/2
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