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6x+15=8x+9
We move all terms to the left:
6x+15-(8x+9)=0
We get rid of parentheses
6x-8x-9+15=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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