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6.99+1.40x=15.39
We move all terms to the left:
6.99+1.40x-(15.39)=0
We add all the numbers together, and all the variables
1.40x-8.4=0
We move all terms containing x to the left, all other terms to the right
1.40x=8.4
x=8.4/1.40
x=6+1.7763568394003E-15/1.40
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