5a-9-6a-15+7a=12-a-2a-3a

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Solution for 5a-9-6a-15+7a=12-a-2a-3a equation: 



5a-9-6a-15+7a=12-a-2a-3a

We move all terms to the left:

5a-9-6a-15+7a-(12-a-2a-3a)=0

We add all the numbers together, and all the variables

5a-6a+7a-(-6a+12)-9-15=0

We add all the numbers together, and all the variables

6a-(-6a+12)-24=0

We get rid of parentheses

6a+6a-12-24=0

We add all the numbers together, and all the variables

12a-36=0

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

12a=36

a=36/12

a=3

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