1+3a+4a=15

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Solution for 1+3a+4a=15 equation: 



1+3a+4a=15

We move all terms to the left:

1+3a+4a-(15)=0

We add all the numbers together, and all the variables

7a-14=0

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

7a=14

a=14/7

a=2

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