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-9+8x=15x+19
We move all terms to the left:
-9+8x-(15x+19)=0
We get rid of parentheses
8x-15x-19-9=0
We add all the numbers together, and all the variables
-7x-28=0
We move all terms containing x to the left, all other terms to the right
-7x=28
x=28/-7
x=-4
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