20=5a-15

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Solution for 20=5a-15 equation: 



20=5a-15

We move all terms to the left:

20-(5a-15)=0

We get rid of parentheses

-5a+15+20=0

We add all the numbers together, and all the variables

-5a+35=0

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

-5a=-35

a=-35/-5

a=+7

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