8x+15=21+9x

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Solution for 8x+15=21+9x equation: 



8x+15=21+9x

We move all terms to the left:

8x+15-(21+9x)=0

We add all the numbers together, and all the variables

8x-(9x+21)+15=0

We get rid of parentheses

8x-9x-21+15=0

We add all the numbers together, and all the variables

-1x-6=0

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

-x=6

x=6/-1

x=-6

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