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15x+30+12x-60+6x-10-3x=20
We move all terms to the left:
15x+30+12x-60+6x-10-3x-(20)=0
We add all the numbers together, and all the variables
30x-60=0
We move all terms containing x to the left, all other terms to the right
30x=60
x=60/30
x=2
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