3a-5-a=-15

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Solution for 3a-5-a=-15 equation: 



3a-5-a=-15

We move all terms to the left:

3a-5-a-(-15)=0

We add all the numbers together, and all the variables

2a+10=0

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

2a=-10

a=-10/2

a=-5

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