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3x+12+3x+15=8x+17
We move all terms to the left:
3x+12+3x+15-(8x+17)=0
We add all the numbers together, and all the variables
6x-(8x+17)+27=0
We get rid of parentheses
6x-8x-17+27=0
We add all the numbers together, and all the variables
-2x+10=0
We move all terms containing x to the left, all other terms to the right
-2x=-10
x=-10/-2
x=+5
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