x+2x+(2x-9)=81

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Solution for x+2x+(2x-9)=81 equation: 



x+2x+(2x-9)=81

We move all terms to the left:

x+2x+(2x-9)-(81)=0

We add all the numbers together, and all the variables

3x+(2x-9)-81=0

We get rid of parentheses

3x+2x-9-81=0

We add all the numbers together, and all the variables

5x-90=0

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

5x=90

x=90/5

x=18

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