2-1/2x=y

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


x in (-oo:+oo)

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

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

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

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

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

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

x = -2*(y-2)

x = -2*(y-2)

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