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x in (-oo:+oo)
y = (5*x)/7 // - (5*x)/7
y-((5*x)/7) = 0
(-5/7)*x+y = 0
y-5/7*x = 0 // - y
-5/7*x = -y // : -5/7
x = -y/(-5/7)
x = 7/5*y
x = 7/5*y
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