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-0.72x+0.42x=8.1
We move all terms to the left:
-0.72x+0.42x-(8.1)=0
We add all the numbers together, and all the variables
-0.3x-8.1=0
We move all terms containing x to the left, all other terms to the right
-0.3x=8.1
x=8.1/-0.3
x=-27
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