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x in (-oo:+oo)
((6.7*x)/0.4)*y = 11 // - 11
((6.7*x)/0.4)*y-11 = 0
16.75*x*y-11 = 0 // + 11
16.75*x*y = 11 // : 16.75*y
x = 11/(16.75*y)
x = 0.65671642*y^-1
x = 0.65671642*y^-1
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