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x in (-oo:+oo)
x = y/4+y/5+y/3+15 // - y/4+y/5+y/3+15
x-(y/4)-(y/5)-(y/3)-15 = 0
x-47/60*y-15 = 0 // + -47/60*y-15
x = -(-47/60*y-15)
x = 15-(-47/60*y)
x = 15-(-47/60*y)
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