R=1/2x+y

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Solution for R=1/2x+y equation: 


x in (-oo:+oo)

R = (1/2)*x+y // - (1/2)*x+y

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

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

R-1/2*x-y = 0 // - R-y

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

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

x = -2*(y-R)

x = -2*(y-R)

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