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x in (-oo:+oo)
((7*x)/2)*y = 4500 // - 4500
((7*x)/2)*y-4500 = 0
7/2*x*y-4500 = 0 // + 4500
7/2*x*y = 4500 // : 7/2*y
x = 4500/(7/2*y)
x = 9000/7*y^-1
x = 9000/7*y^-1
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