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x in (-oo:+oo)
y = (63/16)*x // - (63/16)*x
y-((63/16)*x) = 0
(-63/16)*x+y = 0
y-63/16*x = 0 // - y
-63/16*x = -y // : -63/16
x = -y/(-63/16)
x = 16/63*y
x = 16/63*y
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