1-3a-7=3

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Solution for 1-3a-7=3 equation: 



1-3a-7=3

We move all terms to the left:

1-3a-7-(3)=0

We add all the numbers together, and all the variables

-3a-9=0

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

-3a=9

a=9/-3

a=-3

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