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x in (-oo:+oo)
y = 7/15-x // - 7/15-x
x+y-(7/15) = 0
x+y-7/15 = 0
x+y-7/15 = 0 // - y-7/15
x = -(y-7/15)
x = 7/15-y
x = 7/15-y
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