5-4a=20

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Solution for 5-4a=20 equation: 



5-4a=20

We move all terms to the left:

5-4a-(20)=0

We add all the numbers together, and all the variables

-4a-15=0

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

-4a=15

a=15/-4

a=-3+3/4

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