-18=4a+5a

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Solution for -18=4a+5a equation: 



-18=4a+5a

We move all terms to the left:

-18-(4a+5a)=0

We add all the numbers together, and all the variables

-(+9a)-18=0

We get rid of parentheses

-9a-18=0

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

-9a=18

a=18/-9

a=-2

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