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expand ((5*x+3)*(1-x)*(1+6*x))
solve(-30*x**3 + 7*x**2 + 20*x + 3, x)
diff(-30*x**3 + 7*x**2 + 20*x + 3, x)
series(-30*x**3 + 7*x**2 + 20*x + 3, x, 0, 10)
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