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1*x^4+4*x^2+0*x^3+0*x+4 = 0;x
x
(7/6)*x+(7/15)*y-33000;2*x+2.8*y-45000
(7/15)*x^2+(7/6)*x^1-33000 = 0;x
x
3*x^3-1
(e^(3*x)-e^(-3*x))^2
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