(100+a)(1-0,8)=a

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Solution for (100+a)(1-0,8)=a equation: 



(100+a)(1-0.8)=a

We move all terms to the left:

(100+a)(1-0.8)-(a)=0

We add all the numbers together, and all the variables

(a+100)(0.2)-a=0

We add all the numbers together, and all the variables

-1a+(a+100)(0.2)=0

We multiply parentheses ..

-1a+(+0.2a+20)=0

We add all the numbers together, and all the variables

-1a+(0.2a+20)=0

We get rid of parentheses

-1a+0.2a+20=0

We add all the numbers together, and all the variables

-0.8a+20=0

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

-0.8a=-20

a=-20/-0.8

a=+25

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