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(4/5)*x*y = 16 // - 16
(4/5)*x*y-16 = 0
4/5*x*y-16 = 0 // + 16
4/5*x*y = 16 // : 4/5*y
x = 16/(4/5*y)
x = 20*y^-1
x = 20*y^-1
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