7a=12a-15

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Solution for 7a=12a-15 equation: 



7a=12a-15

We move all terms to the left:

7a-(12a-15)=0

We get rid of parentheses

7a-12a+15=0

We add all the numbers together, and all the variables

-5a+15=0

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

-5a=-15

a=-15/-5

a=+3

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