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x in (-oo:+oo)
(7*y)/5 = 8*x // - 8*x
(7*y)/5-(8*x) = 0
(7*y)/5-8*x = 0
7/5*y-8*x = 0 // - 7/5*y
-8*x = -(7/5*y) // : -8
x = (-(7/5*y))/(-8)
x = 7/40*y
x = 7/40*y
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