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-7.2x+3.4=-8.7x-10
We move all terms to the left:
-7.2x+3.4-(-8.7x-10)=0
We get rid of parentheses
-7.2x+8.7x+10+3.4=0
We add all the numbers together, and all the variables
1.5x+13.4=0
We move all terms containing x to the left, all other terms to the right
1.5x=-13.4
x=-13.4/1.5
x=-8+1/1.0714285714286
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