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8.6+0.9x=15.9
We move all terms to the left:
8.6+0.9x-(15.9)=0
We add all the numbers together, and all the variables
0.9x-7.3=0
We move all terms containing x to the left, all other terms to the right
0.9x=7.3
x=7.3/0.9
x=8+0.1/0.9
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