(5a-90)+a=90

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Solution for (5a-90)+a=90 equation: 



(5a-90)+a=90

We move all terms to the left:

(5a-90)+a-(90)=0

We add all the numbers together, and all the variables

a+(5a-90)-90=0

We get rid of parentheses

a+5a-90-90=0

We add all the numbers together, and all the variables

6a-180=0

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

6a=180

a=180/6

a=30

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