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x in (-oo:+oo)
(1/2)*x+y+5 = 100 // - 100
(1/2)*x+y-100+5 = 0
1/2*x+y-95 = 0 // - y-95
1/2*x = -(y-95) // : 1/2
x = (-(y-95))/1/2
x = 2*(95-y)
x = 2*(95-y)
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