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53-(x*((2*y)/5)) = 0
(-2/5)*x*y+53 = 0
53-2/5*x*y = 0 // - 53
-2/5*x*y = -53 // : -2/5*y
x = -53/(-2/5*y)
x = 265/2*y^-1
x = 265/2*y^-1
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