4/5x-1/5x=9

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


x in (-oo:+oo)

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

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

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

3/5*x-9 = 0 // + 9

3/5*x = 9 // : 3/5

x = 9/3/5

x = 15

x = 15

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