8x+9=-x+81

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Solution for 8x+9=-x+81 equation: 



8x+9=-x+81

We move all terms to the left:

8x+9-(-x+81)=0

We add all the numbers together, and all the variables

8x-(-1x+81)+9=0

We get rid of parentheses

8x+1x-81+9=0

We add all the numbers together, and all the variables

9x-72=0

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

9x=72

x=72/9

x=8

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