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x in (-oo:+oo)
x+y/2 = 65 // - 65
x+y/2-65 = 0
x+1/2*y-65 = 0 // - 1/2*y-65
x = -(1/2*y-65)
x = 65-(1/2*y)
x = 65-(1/2*y)
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