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-7.2x+3.5=-8.7x-10
We move all terms to the left:
-7.2x+3.5-(-8.7x-10)=0
We get rid of parentheses
-7.2x+8.7x+10+3.5=0
We add all the numbers together, and all the variables
1.5x+13.5=0
We move all terms containing x to the left, all other terms to the right
1.5x=-13.5
x=-13.5/1.5
x=-9
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