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30+15x=36+12x
We move all terms to the left:
30+15x-(36+12x)=0
We add all the numbers together, and all the variables
15x-(12x+36)+30=0
We get rid of parentheses
15x-12x-36+30=0
We add all the numbers together, and all the variables
3x-6=0
We move all terms containing x to the left, all other terms to the right
3x=6
x=6/3
x=2
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