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

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


x in (-oo:+oo)

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

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

(x-5)/4+(-1*(x-9))/3 = 0

(3*(x-5))/(3*4)+(-1*4*(x-9))/(3*4) = 0

3*(x-5)-1*4*(x-9) = 0

21-x = 0

(21-x)/(3*4) = 0

(21-x)/(3*4) = 0 // * 3*4

21-x = 0

21-x = 0 // - 21

-x = -21 // * -1

x = 21

x = 21

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