8x+9=5x-21

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Solution for 8x+9=5x-21 equation: 



8x+9=5x-21

We move all terms to the left:

8x+9-(5x-21)=0

We get rid of parentheses

8x-5x+21+9=0

We add all the numbers together, and all the variables

3x+30=0

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

3x=-30

x=-30/3

x=-10

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