a-9=4a-15

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Solution for a-9=4a-15 equation: 



a-9=4a-15

We move all terms to the left:

a-9-(4a-15)=0

We get rid of parentheses

a-4a+15-9=0

We add all the numbers together, and all the variables

-3a+6=0

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

-3a=-6

a=-6/-3

a=+2

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