2a+12=90

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Solution for 2a+12=90 equation: 



2a+12=90

We move all terms to the left:

2a+12-(90)=0

We add all the numbers together, and all the variables

2a-78=0

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

2a=78

a=78/2

a=39

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