15+a+2a=45

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Solution for 15+a+2a=45 equation: 



15+a+2a=45

We move all terms to the left:

15+a+2a-(45)=0

We add all the numbers together, and all the variables

3a-30=0

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

3a=30

a=30/3

a=10

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