x+(9-x)+4x=81

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Solution for x+(9-x)+4x=81 equation: 



x+(9-x)+4x=81

We move all terms to the left:

x+(9-x)+4x-(81)=0

We add all the numbers together, and all the variables

x+(-1x+9)+4x-81=0

We add all the numbers together, and all the variables

5x+(-1x+9)-81=0

We get rid of parentheses

5x-1x+9-81=0

We add all the numbers together, and all the variables

4x-72=0

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

4x=72

x=72/4

x=18

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