40-3a=28

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Solution for 40-3a=28 equation: 



40-3a=28

We move all terms to the left:

40-3a-(28)=0

We add all the numbers together, and all the variables

-3a+12=0

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

-3a=-12

a=-12/-3

a=+4

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