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