18x-9=81

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Solution for 18x-9=81 equation: 



18x-9=81

We move all terms to the left:

18x-9-(81)=0

We add all the numbers together, and all the variables

18x-90=0

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

18x=90

x=90/18

x=5

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