a.3+5=12

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Solution for a.3+5=12 equation: 



a.3+5=12

We move all terms to the left:

a.3+5-(12)=0

We add all the numbers together, and all the variables

a.3-7=0

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

a.3=7

a=7/1

a=7

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