12-15a=18

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Solution for 12-15a=18 equation: 



12-15a=18

We move all terms to the left:

12-15a-(18)=0

We add all the numbers together, and all the variables

-15a-6=0

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

-15a=6

a=6/-15

a=-2/5

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