15=90-a

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Solution for 15=90-a equation: 



15=90-a

We move all terms to the left:

15-(90-a)=0

We add all the numbers together, and all the variables

-(-1a+90)+15=0

We get rid of parentheses

1a-90+15=0

We add all the numbers together, and all the variables

a-75=0

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

a=75

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