(90-x)/(180-x)=2/5

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Solution for (90-x)/(180-x)=2/5 equation: 



(90-x)/(180-x)=2/5

We move all terms to the left:

(90-x)/(180-x)-(2/5)=0



Domain of the equation: (180-x)!=0

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

-x!=-180

x!=-180/-1

x!=+180

x∈R



We add all the numbers together, and all the variables

(-1x+90)/(-1x+180)-(+2/5)=0

We get rid of parentheses

(-1x+90)/(-1x+180)-2/5=0

We calculate fractions


(-5x+450)/(-5x+900)+(2x-360)/(-5x+900)=0

We multiply all the terms by the denominator


(-5x+450)+(2x-360)=0

We get rid of parentheses

-5x+2x+450-360=0

We add all the numbers together, and all the variables

-3x+90=0

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

-3x=-90

x=-90/-3

x=+30

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