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-0.66x+0.36x=8.7
We move all terms to the left:
-0.66x+0.36x-(8.7)=0
We add all the numbers together, and all the variables
-0.3x-8.7=0
We move all terms containing x to the left, all other terms to the right
-0.3x=8.7
x=8.7/-0.3
x=-29
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