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x in (-oo:+oo)
(1/2)*x+y = 5 // - 5
(1/2)*x+y-5 = 0
1/2*x+y-5 = 0 // - y-5
1/2*x = -(y-5) // : 1/2
x = (-(y-5))/1/2
x = 2*(5-y)
x = 2*(5-y)
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