12a-5=7a+15

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Solution for 12a-5=7a+15 equation: 



12a-5=7a+15

We move all terms to the left:

12a-5-(7a+15)=0

We get rid of parentheses

12a-7a-15-5=0

We add all the numbers together, and all the variables

5a-20=0

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

5a=20

a=20/5

a=4

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