-9a=-42

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Solution for -9a=-42 equation: 



-9a=-42

We move all terms to the left:

-9a-(-42)=0

We add all the numbers together, and all the variables

-9a+42=0

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

-9a=-42

a=-42/-9

a=4+2/3

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