13x+9=3x-21

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Solution for 13x+9=3x-21 equation: 



13x+9=3x-21

We move all terms to the left:

13x+9-(3x-21)=0

We get rid of parentheses

13x-3x+21+9=0

We add all the numbers together, and all the variables

10x+30=0

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

10x=-30

x=-30/10

x=-3

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