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x in (-oo:+oo)
y = (e^7*x)/8 // - (e^7*x)/8
y-((e^7*x)/8) = 0
(-((e^7)/8))*x+y = 0 // - y
(-((e^7)/8))*x = -y // : -((e^7)/8)
x = -y/(-((e^7)/8))
x = y/((e^7)/8)
x = y/((e^7)/8)
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