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.15x-9-8x=12
We move all terms to the left:
.15x-9-8x-(12)=0
We add all the numbers together, and all the variables
-7.85x-21=0
We move all terms containing x to the left, all other terms to the right
-7.85x=21
x=21/-7.85
x=-2+4.0769230769231/6.0384615384615
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