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(81*y)/2-((25*x)/2) = 0
(-25/2)*x+(81*y)/2 = 0
81/2*y-25/2*x = 0 // - 81/2*y
-25/2*x = -(81/2*y) // : -25/2
x = (-(81/2*y))/(-25/2)
x = 81/25*y
x = 81/25*y
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