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4-3x+7x=-8.7
We move all terms to the left:
4-3x+7x-(-8.7)=0
We add all the numbers together, and all the variables
4x+12.7=0
We move all terms containing x to the left, all other terms to the right
4x=-12.7
x=-12.7/4
x=-3+0.7/4
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