120-18a=78

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Solution for 120-18a=78 equation: 



120-18a=78

We move all terms to the left:

120-18a-(78)=0

We add all the numbers together, and all the variables

-18a+42=0

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

-18a=-42

a=-42/-18

a=2+1/3

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