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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
-10x+12.7=0
We move all terms containing x to the left, all other terms to the right
-10x=-12.7
x=-12.7/-10
x=1+1/3.7037037037037
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