1/2x+2/5x-4/5=-1

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Solution for 1/2x+2/5x-4/5=-1 equation: 


x in (-oo:+oo)

(1/2)*x+(2/5)*x-(4/5) = -1 // + 1

(1/2)*x+(2/5)*x-(4/5)+1 = 0

(1/2)*x+(2/5)*x-4/5+1 = 0

9/10*x+1/5 = 0 // - 1/5

9/10*x = -1/5 // : 9/10

x = -1/5/9/10

x = -2/9

x = -2/9

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