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6x-15=3x-30
We move all terms to the left:
6x-15-(3x-30)=0
We get rid of parentheses
6x-3x+30-15=0
We add all the numbers together, and all the variables
3x+15=0
We move all terms containing x to the left, all other terms to the right
3x=-15
x=-15/3
x=-5
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