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8.7x-11.3=40.9
We move all terms to the left:
8.7x-11.3-(40.9)=0
We add all the numbers together, and all the variables
8.7x-52.2=0
We move all terms containing x to the left, all other terms to the right
8.7x=52.2
x=52.2/8.7
x=6+7.105427357601E-15/8.7
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