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-8.5-3x-8.7-x=-3x-13.3
We move all terms to the left:
-8.5-3x-8.7-x-(-3x-13.3)=0
We add all the numbers together, and all the variables
-4x-(-3x-13.3)-17.2=0
We get rid of parentheses
-4x+3x+13.3-17.2=0
We add all the numbers together, and all the variables
-1x-3.9=0
We move all terms containing x to the left, all other terms to the right
-x=3.9
x=3.9/-1
x=-3+0.9/1
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