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-0.5x-3.5=(-12)
We move all terms to the left:
-0.5x-3.5-((-12))=0
We add all the numbers together, and all the variables
-0.5x+8.5=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-8.5
x=-8.5/-0.5
x=+17
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