a+3a+4a-5=115

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Solution for a+3a+4a-5=115 equation: 



a+3a+4a-5=115

We move all terms to the left:

a+3a+4a-5-(115)=0

We add all the numbers together, and all the variables

8a-120=0

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

8a=120

a=120/8

a=15

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