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15x+6=3x+78
We move all terms to the left:
15x+6-(3x+78)=0
We get rid of parentheses
15x-3x-78+6=0
We add all the numbers together, and all the variables
12x-72=0
We move all terms containing x to the left, all other terms to the right
12x=72
x=72/12
x=6
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