(20x-9)+(10x+9)=90

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Solution for (20x-9)+(10x+9)=90 equation: 



(20x-9)+(10x+9)=90

We move all terms to the left:

(20x-9)+(10x+9)-(90)=0

We get rid of parentheses

20x+10x-9+9-90=0

We add all the numbers together, and all the variables

30x-90=0

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

30x=90

x=90/30

x=3

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