5x-9+x=81

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Solution for 5x-9+x=81 equation: 



5x-9+x=81

We move all terms to the left:

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

We add all the numbers together, and all the variables

6x-90=0

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

6x=90

x=90/6

x=15

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