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8*sin(x)+13*cos(x)+9*ln(x)+14*x^-7
x^2+2.5*x-(0.5*2)+1 = 0
((x/2)*x-1)^2+x^2 = 2
2*x-(3*y)-13;4*x-(6*y)-26
5;6;7;7;5;0
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