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