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15+2x=8+9x
We move all terms to the left:
15+2x-(8+9x)=0
We add all the numbers together, and all the variables
2x-(9x+8)+15=0
We get rid of parentheses
2x-9x-8+15=0
We add all the numbers together, and all the variables
-7x+7=0
We move all terms containing x to the left, all other terms to the right
-7x=-7
x=-7/-7
x=1
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