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8.4x-3.2=-8.5x-7.1
We move all terms to the left:
8.4x-3.2-(-8.5x-7.1)=0
We get rid of parentheses
8.4x+8.5x+7.1-3.2=0
We add all the numbers together, and all the variables
16.9x+3.9=0
We move all terms containing x to the left, all other terms to the right
16.9x=-3.9
x=-3.9/16.9
x=-2.0526315789474/8.8947368421053
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