9(90-x)=4(180-x)-20

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Solution for 9(90-x)=4(180-x)-20 equation: 



9(90-x)=4(180-x)-20

We move all terms to the left:

9(90-x)-(4(180-x)-20)=0

We add all the numbers together, and all the variables

9(-1x+90)-(4(-1x+180)-20)=0

We multiply parentheses

-9x-(4(-1x+180)-20)+810=0



We calculate terms in parentheses: -(4(-1x+180)-20), so:

4(-1x+180)-20

We multiply parentheses

-4x+720-20

We add all the numbers together, and all the variables

-4x+700

Back to the equation:

-(-4x+700)



We get rid of parentheses

-9x+4x-700+810=0

We add all the numbers together, and all the variables

-5x+110=0

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

-5x=-110

x=-110/-5

x=+22

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