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x in (-oo:+oo)
((10*x)/30)*y = 1 // - 1
((10*x)/30)*y-1 = 0
1/3*x*y-1 = 0 // + 1
1/3*x*y = 1 // : 1/3*y
x = 1/(1/3*y)
x = 3*y^-1
x = 3*y^-1
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