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6x=21+15+3x
We move all terms to the left:
6x-(21+15+3x)=0
We add all the numbers together, and all the variables
6x-(3x+36)=0
We get rid of parentheses
6x-3x-36=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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