1/2x-y=21

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Solution for 1/2x-y=21 equation: 


x in (-oo:+oo)

(1/2)*x-y = 21 // - 21

(1/2)*x-y-21 = 0

1/2*x-y-21 = 0 // + -y-21

1/2*x = -(-y-21) // : 1/2

x = (-(-y-21))/1/2

x = 2*(y+21)

x = 2*(y+21)

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