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6x-15=3x+6.
We move all terms to the left:
6x-15-(3x+6.)=0
We add all the numbers together, and all the variables
6x-(3x+6)-15=0
We get rid of parentheses
6x-3x-6-15=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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