1/2x-2/5x=39

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Solution for 1/2x-2/5x=39 equation: 


x in (-oo:+oo)

(1/2)*x-((2/5)*x) = 39 // - 39

(1/2)*x-((2/5)*x)-39 = 0

(1/2)*x+(-2/5)*x-39 = 0

1/10*x-39 = 0 // + 39

1/10*x = 39 // : 1/10

x = 39/1/10

x = 390

x = 390

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