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x in (-oo:+oo)
x*((7*y)/2) = 7 // - 7
x*((7*y)/2)-7 = 0
7/2*x*y-7 = 0 // + 7
7/2*x*y = 7 // : 7/2*y
x = 7/(7/2*y)
x = 2*y^-1
x = 2*y^-1
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