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15x-30-6x=6-3x+12
We move all terms to the left:
15x-30-6x-(6-3x+12)=0
We add all the numbers together, and all the variables
15x-6x-(-3x+18)-30=0
We add all the numbers together, and all the variables
9x-(-3x+18)-30=0
We get rid of parentheses
9x+3x-18-30=0
We add all the numbers together, and all the variables
12x-48=0
We move all terms containing x to the left, all other terms to the right
12x=48
x=48/12
x=4
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