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-7.2+3.6x-8.1x=1.86
We move all terms to the left:
-7.2+3.6x-8.1x-(1.86)=0
We add all the numbers together, and all the variables
-4.5x-9.06=0
We move all terms containing x to the left, all other terms to the right
-4.5x=9.06
x=9.06/-4.5
x=-2+0.06/4.5
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