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x in (-oo:+oo)
x = y/b-15 // - y/b-15
x-(y/b)+15 = 0
x-(b^-1*y)+15 = 0 // - 15-(b^-1*y)
x = -(15-(b^-1*y))
x = b^-1*y-15
x = b^-1*y-15
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