1/5x+1/4x=9 - solution

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Solution for 1/5x+1/4x=9 equation:

x in (-oo:+oo)

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

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

9/20*x-9 = 0 // + 9

9/20*x = 9 // : 9/20

x = 9/9/20

x = 20

x = 20

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