$5x^2-x-18$
$-6\cdot13-4$
$5x+3y=14$
$y'=-3x^2y$
$\int\left(x^3\right)sin\:nx\:dx$
$30c+45$
$\int\frac{2x+3}{\left(x-1\right)x\left(x+2\right)}dx$
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