20-3a=5

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Solution for 20-3a=5 equation: 



20-3a=5

We move all terms to the left:

20-3a-(5)=0

We add all the numbers together, and all the variables

-3a+15=0

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

-3a=-15

a=-15/-3

a=+5

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