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x in (-oo:+oo)
x = (9*y)/8-72 // - (9*y)/8-72
x-((9*y)/8)+72 = 0
x+(-9/8)*y+72 = 0
x-9/8*y+72 = 0 // - 72-9/8*y
x = -(72-9/8*y)
x = -(72-9/8*y)
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