1-5a=21

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Solution for 1-5a=21 equation: 



1-5a=21

We move all terms to the left:

1-5a-(21)=0

We add all the numbers together, and all the variables

-5a-20=0

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

-5a=20

a=20/-5

a=-4

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