4a=5a-90

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Solution for 4a=5a-90 equation: 



4a=5a-90

We move all terms to the left:

4a-(5a-90)=0

We get rid of parentheses

4a-5a+90=0

We add all the numbers together, and all the variables

-1a+90=0

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

-a=-90

a=-90/-1

a=+90

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