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0.2 = x*y-x-(5*((x*y)/100)) // - x*y-x-(5*((x*y)/100))
x-(x*y)+5*((x*y)/100)+0.2 = 0
0.2-19/20*x*y = 0 // - 0.2
-19/20*x*y = -0.2 // : -19/20*y
x = -0.2/(-19/20*y)
x = 0.21052632*y^-1
x = 0.21052632*y^-1
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