15-3a=a-1

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Solution for 15-3a=a-1 equation: 



15-3a=a-1

We move all terms to the left:

15-3a-(a-1)=0

We get rid of parentheses

-3a-a+1+15=0

We add all the numbers together, and all the variables

-4a+16=0

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

-4a=-16

a=-16/-4

a=+4

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