4a+a=90

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Solution for 4a+a=90 equation: 



4a+a=90

We move all terms to the left:

4a+a-(90)=0

We add all the numbers together, and all the variables

5a-90=0

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

5a=90

a=90/5

a=18

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