$-5bc-bc$
$4x^2-4xy^2+y^4$
$\int sinx\cdot e^{7x}dx$
$4\left(9f+1\right)+2$
$\frac{d^2x}{d^2t}-3$
$2x+30>850$
$4x^2+3x+5;\:x=2$
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