9a+28(10a)=90

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Solution for 9a+28(10a)=90 equation: 



9a+28(10a)=90

We move all terms to the left:

9a+28(10a)-(90)=0

We add all the numbers together, and all the variables

2819a-90=0

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

2819a=90

a=90/2819

a=90/2819

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