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0.5097*x-y+12.391;196.95*x-24.634*x^2-y-374.71
0.5097*x-y+12.391;196.95-24.634*x^2-y-374.71
8*x^2*sin(x)*tan(x)
(2/3)*u = 11/20
4-(1/x) = (6/2)*x
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