7+3a=12+a

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Solution for 7+3a=12+a equation: 



7+3a=12+a

We move all terms to the left:

7+3a-(12+a)=0

We add all the numbers together, and all the variables

3a-(a+12)+7=0

We get rid of parentheses

3a-a-12+7=0

We add all the numbers together, and all the variables

2a-5=0

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

2a=5

a=5/2

a=2+1/2

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