(2+x)/(7+x)=5/4

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Solution for (2+x)/(7+x)=5/4 equation: 


D( x )

x+7 = 0

x+7 = 0

x+7 = 0

x+7 = 0 // - 7

x = -7

x in (-oo:-7) U (-7:+oo)

(x+2)/(x+7) = 5/4 // - 5/4

(x+2)/(x+7)-(5/4) = 0

(x+2)/(x+7)-5/4 = 0

(4*(x+2))/(4*(x+7))+(-5*(x+7))/(4*(x+7)) = 0

4*(x+2)-5*(x+7) = 0

-x-27 = 0

(-x-27)/(4*(x+7)) = 0

(-x-27)/(4*(x+7)) = 0 // * 4*(x+7)

-x-27 = 0

-x-27 = 0 // + 27

-x = 27 // * -1

x = -27

x = -27

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