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1.5x-1+2x-4=-12
We move all terms to the left:
1.5x-1+2x-4-(-12)=0
We add all the numbers together, and all the variables
3.5x+7=0
We move all terms containing x to the left, all other terms to the right
3.5x=-7
x=-7/3.5
x=-2
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