8-20=10x+9-13x

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Solution for 8-20=10x+9-13x equation: 



8-20=10x+9-13x

We move all terms to the left:

8-20-(10x+9-13x)=0

We add all the numbers together, and all the variables

-(-3x+9)+8-20=0

We add all the numbers together, and all the variables

-(-3x+9)-12=0

We get rid of parentheses

3x-9-12=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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