4a+12=90

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Solution for 4a+12=90 equation: 



4a+12=90

We move all terms to the left:

4a+12-(90)=0

We add all the numbers together, and all the variables

4a-78=0

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

4a=78

a=78/4

a=19+1/2

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