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15=-0.75(x)+9
We move all terms to the left:
15-(-0.75(x)+9)=0
We get rid of parentheses
0.75x-9+15=0
We add all the numbers together, and all the variables
0.75x+6=0
We move all terms containing x to the left, all other terms to the right
0.75x=-6
x=-6/0.75
x=-8
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