(3-x)/7=(x-9)/4

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Solution for (3-x)/7=(x-9)/4 equation: 


x in (-oo:+oo)

(3-x)/7 = (x-9)/4 // - (x-9)/4

(3-x)/7-((x-9)/4) = 0

(3-x)/7+(-1*(x-9))/4 = 0

(4*(3-x))/(4*7)+(-1*7*(x-9))/(4*7) = 0

4*(3-x)-1*7*(x-9) = 0

75-11*x = 0

(75-11*x)/(4*7) = 0

(75-11*x)/(4*7) = 0 // * 4*7

75-11*x = 0

75-11*x = 0 // - 75

-11*x = -75 // : -11

x = -75/(-11)

x = 75/11

x = 75/11

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