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3.6x+12.9=-1.5
We move all terms to the left:
3.6x+12.9-(-1.5)=0
We add all the numbers together, and all the variables
3.6x+14.4=0
We move all terms containing x to the left, all other terms to the right
3.6x=-14.4
x=-14.4/3.6
x=-4
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