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-0.57x+-0.27x=8.1
We move all terms to the left:
-0.57x+-0.27x-(8.1)=0
We add all the numbers together, and all the variables
-0.84x-8.1=0
We move all terms containing x to the left, all other terms to the right
-0.84x=8.1
x=8.1/-0.84
x=-9+0.54/0.84
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