2/5x+1/2y=9

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Solution for 2/5x+1/2y=9 equation: 


x in (-oo:+oo)

(2/5)*x+(1/2)*y = 9 // - 9

(2/5)*x+(1/2)*y-9 = 0

2/5*x+1/2*y-9 = 0 // - 1/2*y-9

2/5*x = -(1/2*y-9) // : 2/5

x = (-(1/2*y-9))/2/5

x = 5/2*(9-(1/2*y))

x = 5/2*(9-(1/2*y))

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