6x-15=3x-21

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Solution for 6x-15=3x-21 equation: 



6x-15=3x-21

We move all terms to the left:

6x-15-(3x-21)=0

We get rid of parentheses

6x-3x+21-15=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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