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15x-6x-3x=21.6
We move all terms to the left:
15x-6x-3x-(21.6)=0
We add all the numbers together, and all the variables
6x-21.6=0
We move all terms containing x to the left, all other terms to the right
6x=21.6
x=21.6/6
x=3+1/1.6666666666667
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