42-3a=6

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Solution for 42-3a=6 equation: 



42-3a=6

We move all terms to the left:

42-3a-(6)=0

We add all the numbers together, and all the variables

-3a+36=0

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

-3a=-36

a=-36/-3

a=+12

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