15a-7a-5a-1=20

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Solution for 15a-7a-5a-1=20 equation: 



15a-7a-5a-1=20

We move all terms to the left:

15a-7a-5a-1-(20)=0

We add all the numbers together, and all the variables

3a-21=0

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

3a=21

a=21/3

a=7

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