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3x+12=5x+5+10x
We move all terms to the left:
3x+12-(5x+5+10x)=0
We add all the numbers together, and all the variables
3x-(15x+5)+12=0
We get rid of parentheses
3x-15x-5+12=0
We add all the numbers together, and all the variables
-12x+7=0
We move all terms containing x to the left, all other terms to the right
-12x=-7
x=-7/-12
x=7/12
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