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-8.6-1.3x=8.7x+0.4
We move all terms to the left:
-8.6-1.3x-(8.7x+0.4)=0
We get rid of parentheses
-1.3x-8.7x-0.4-8.6=0
We add all the numbers together, and all the variables
-10x-9=0
We move all terms containing x to the left, all other terms to the right
-10x=9
x=9/-10
x=-9/10
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