$\left(-7-8\right)\cdot9$
$x^2+4x=13$
$5a-b+bc+3a-4b-3c+d$
$\int\frac{7x+3}{x^2-3x-4}dx$
$-x^2+60x-779$
$-8\:x\:4$
$\frac{10z}{5\sqrt{z}}$
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