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x in (-oo:+oo)
y = (7*x)/8-(3*x) // - (7*x)/8-(3*x)
3*x-((7*x)/8)+y = 0
(-7/8)*x+3*x+y = 0
17/8*x+y = 0 // - y
17/8*x = -y // : 17/8
x = -y/17/8
x = -8/17*y
x = -8/17*y
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