9+2a=90

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Solution for 9+2a=90 equation: 



9+2a=90

We move all terms to the left:

9+2a-(90)=0

We add all the numbers together, and all the variables

2a-81=0

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

2a=81

a=81/2

a=40+1/2

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