a+8a+18=90

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Solution for a+8a+18=90 equation: 



a+8a+18=90

We move all terms to the left:

a+8a+18-(90)=0

We add all the numbers together, and all the variables

9a-72=0

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

9a=72

a=72/9

a=8

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