8x+21=5x-30

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Solution for 8x+21=5x-30 equation: 



8x+21=5x-30

We move all terms to the left:

8x+21-(5x-30)=0

We get rid of parentheses

8x-5x+30+21=0

We add all the numbers together, and all the variables

3x+51=0

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

3x=-51

x=-51/3

x=-17

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