-9a+8=-172

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Solution for -9a+8=-172 equation: 



-9a+8=-172

We move all terms to the left:

-9a+8-(-172)=0

We add all the numbers together, and all the variables

-9a+180=0

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

-9a=-180

a=-180/-9

a=+20

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