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12x-5.3x-2=15
We move all terms to the left:
12x-5.3x-2-(15)=0
We add all the numbers together, and all the variables
6.7x-17=0
We move all terms containing x to the left, all other terms to the right
6.7x=17
x=17/6.7
x=2+1/1.8611111111111
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