6x-15=8x-21

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Solution for 6x-15=8x-21 equation: 



6x-15=8x-21

We move all terms to the left:

6x-15-(8x-21)=0

We get rid of parentheses

6x-8x+21-15=0

We add all the numbers together, and all the variables

-2x+6=0

We move all terms containing x to the left, all other terms to the right

-2x=-6

x=-6/-2

x=+3

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