15-(5-2a)=20

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Solution for 15-(5-2a)=20 equation: 



15-(5-2a)=20

We move all terms to the left:

15-(5-2a)-(20)=0

We add all the numbers together, and all the variables

-(-2a+5)+15-20=0

We add all the numbers together, and all the variables

-(-2a+5)-5=0

We get rid of parentheses

2a-5-5=0

We add all the numbers together, and all the variables

2a-10=0

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

2a=10

a=10/2

a=5

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