21+8x=6x-9

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Solution for 21+8x=6x-9 equation: 



21+8x=6x-9

We move all terms to the left:

21+8x-(6x-9)=0

We get rid of parentheses

8x-6x+9+21=0

We add all the numbers together, and all the variables

2x+30=0

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

2x=-30

x=-30/2

x=-15

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