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3.1x-11+17=-21.9
We move all terms to the left:
3.1x-11+17-(-21.9)=0
We add all the numbers together, and all the variables
3.1x+27.9=0
We move all terms containing x to the left, all other terms to the right
3.1x=-27.9
x=-27.9/3.1
x=-9+-3.5527136788005E-15/3.1
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