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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-4.7=0
We move all terms containing x to the left, all other terms to the right
-10x=4.7
x=4.7/-10
x=-1.7407407407407/3.7037037037037
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