(8a+1)+(4a+5)=90

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Solution for (8a+1)+(4a+5)=90 equation: 



(8a+1)+(4a+5)=90

We move all terms to the left:

(8a+1)+(4a+5)-(90)=0

We get rid of parentheses

8a+4a+1+5-90=0

We add all the numbers together, and all the variables

12a-84=0

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

12a=84

a=84/12

a=7

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