3(9-x)/15=4/5

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Solution for 3(9-x)/15=4/5 equation: 


x in (-oo:+oo)

(3*(9-x))/15 = 4/5 // - 4/5

(3*(9-x))/15-(4/5) = 0

(3*(9-x))/15-4/5 = 0

(3*5*(9-x))/(5*15)+(-4*15)/(5*15) = 0

3*5*(9-x)-4*15 = 0

75-15*x = 0

(75-15*x)/(5*15) = 0

(75-15*x)/(5*15) = 0 // * 5*15

75-15*x = 0

75-15*x = 0 // - 75

-15*x = -75 // : -15

x = -75/(-15)

x = 5

x = 5

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