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5.3.5x=8.5
We move all terms to the left:
5.3.5x-(8.5)=0
We add all the numbers together, and all the variables
2.65x-8.5=0
We move all terms containing x to the left, all other terms to the right
2.65x=8.5
x=8.5/2.65
x=3+0.55/2.65
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