3a+4a=80

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Solution for 3a+4a=80 equation: 



3a+4a=80

We move all terms to the left:

3a+4a-(80)=0

We add all the numbers together, and all the variables

7a-80=0

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

7a=80

a=80/7

a=11+3/7

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