3a+12=90

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Solution for 3a+12=90 equation: 



3a+12=90

We move all terms to the left:

3a+12-(90)=0

We add all the numbers together, and all the variables

3a-78=0

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

3a=78

a=78/3

a=26

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