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10+15x=9x+12
We move all terms to the left:
10+15x-(9x+12)=0
We get rid of parentheses
15x-9x-12+10=0
We add all the numbers together, and all the variables
6x-2=0
We move all terms containing x to the left, all other terms to the right
6x=2
x=2/6
x=1/3
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