3a+5=12

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Solution for 3a+5=12 equation: 



3a+5=12

We move all terms to the left:

3a+5-(12)=0

We add all the numbers together, and all the variables

3a-7=0

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

3a=7

a=7/3

a=2+1/3

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