15a-3a-3a-5a+1=13

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Solution for 15a-3a-3a-5a+1=13 equation: 



15a-3a-3a-5a+1=13

We move all terms to the left:

15a-3a-3a-5a+1-(13)=0

We add all the numbers together, and all the variables

4a-12=0

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

4a=12

a=12/4

a=3

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