3a+5a-12=84

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Solution for 3a+5a-12=84 equation: 



3a+5a-12=84

We move all terms to the left:

3a+5a-12-(84)=0

We add all the numbers together, and all the variables

8a-96=0

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

8a=96

a=96/8

a=12

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