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6.1x-15.9=8.5
We move all terms to the left:
6.1x-15.9-(8.5)=0
We add all the numbers together, and all the variables
6.1x-24.4=0
We move all terms containing x to the left, all other terms to the right
6.1x=24.4
x=24.4/6.1
x=4
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