3a+5a=72

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Solution for 3a+5a=72 equation: 



3a+5a=72

We move all terms to the left:

3a+5a-(72)=0

We add all the numbers together, and all the variables

8a-72=0

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

8a=72

a=72/8

a=9

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