(0.15)20=0.1x+0.3(20-x)

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Solution for (0.15)20=0.1x+0.3(20-x) equation: 



(0.15)20=0.1x+0.3(20-x)

We move all terms to the left:

(0.15)20-(0.1x+0.3(20-x))=0

We add all the numbers together, and all the variables

-(0.1x+0.3(-1x+20))+(0.15)20=0

We add all the numbers together, and all the variables

-(0.1x+0.3(-1x+20))+3=0



We calculate terms in parentheses: -(0.1x+0.3(-1x+20)), so:

0.1x+0.3(-1x+20)

We multiply parentheses

0.1x-0.3x+6

We add all the numbers together, and all the variables

-0.2x+6

Back to the equation:

-(-0.2x+6)



We get rid of parentheses

0.2x-6+3=0

We add all the numbers together, and all the variables

0.2x-3=0

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

0.2x=3

x=3/0.2

x=15

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