1/2x-1/2y=9

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


x in (-oo:+oo)

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

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

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

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

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

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

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

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

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