40-7a=12

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Solution for 40-7a=12 equation: 



40-7a=12

We move all terms to the left:

40-7a-(12)=0

We add all the numbers together, and all the variables

-7a+28=0

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

-7a=-28

a=-28/-7

a=+4

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