x/(x+7)=3/10

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Solution for x/(x+7)=3/10 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/(x+7) = 3/10 // - 3/10

x/(x+7)-(3/10) = 0

x/(x+7)-3/10 = 0

(10*x)/(10*(x+7))+(-3*(x+7))/(10*(x+7)) = 0

10*x-3*(x+7) = 0

7*x-21 = 0

(7*x-21)/(10*(x+7)) = 0

(7*x-21)/(10*(x+7)) = 0 // * 10*(x+7)

7*x-21 = 0

7*x-21 = 0 // + 21

7*x = 21 // : 7

x = 21/7

x = 3

x = 3

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