-90=8a-18

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Solution for -90=8a-18 equation: 



-90=8a-18

We move all terms to the left:

-90-(8a-18)=0

We get rid of parentheses

-8a+18-90=0

We add all the numbers together, and all the variables

-8a-72=0

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

-8a=72

a=72/-8

a=-9

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