91=-10a-9

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Solution for 91=-10a-9 equation: 



91=-10a-9

We move all terms to the left:

91-(-10a-9)=0

We get rid of parentheses

10a+9+91=0

We add all the numbers together, and all the variables

10a+100=0

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

10a=-100

a=-100/10

a=-10

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