5+(-a)=20

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Solution for 5+(-a)=20 equation: 



5+(-a)=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

(-1a)+5-20=0

We add all the numbers together, and all the variables

(-1a)-15=0

We get rid of parentheses

-1a-15=0

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

-a=15

a=15/-1

a=-15

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