20=a+15

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Solution for 20=a+15 equation: 



20=a+15

We move all terms to the left:

20-(a+15)=0

We get rid of parentheses

-a-15+20=0

We add all the numbers together, and all the variables

-1a+5=0

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

-a=-5

a=-5/-1

a=+5

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