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x in (-oo:+oo)
(5*x)/y = 6.7 // - 6.7
(5*x)/y-6.7 = 0
5*x*y^-1-6.7 = 0 // + 6.7
5*x*y^-1 = 6.7 // : 5*y^-1
x = 6.7/(5*y^-1)
x = 1.34*y
x = 1.34*y
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