7a-3a+2a-a=15

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Solution for 7a-3a+2a-a=15 equation: 



7a-3a+2a-a=15

We move all terms to the left:

7a-3a+2a-a-(15)=0

We add all the numbers together, and all the variables

5a-15=0

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

5a=15

a=15/5

a=3

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