9=1/2*x-y

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Solution for 9=1/2*x-y equation: 


x in (-oo:+oo)

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

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

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

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

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

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

x = 2*(y+9)

x = 2*(y+9)

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