-21+6=6x-9x

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Solution for -21+6=6x-9x equation: 



-21+6=6x-9x

We move all terms to the left:

-21+6-(6x-9x)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(-3x)-15=0

We get rid of parentheses

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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