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y_324 in (-oo:+oo)
(y_324^1)/2 = (81^1)/2 // - (81^1)/2
(y_324^1)/2-((81^1)/2) = 0
y_324/2-81/2 = 0
1/2*y_324-81/2 = 0 // + 81/2
1/2*y_324 = 81/2 // : 1/2
y_324 = 81/2/1/2
y_324 = 81
y_324 = 81
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