4a-28+9+13=90

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Solution for 4a-28+9+13=90 equation: 



4a-28+9+13=90

We move all terms to the left:

4a-28+9+13-(90)=0

We add all the numbers together, and all the variables

4a-96=0

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

4a=96

a=96/4

a=24

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