$-7\cdot\left(-1\right)-4\cdot\left(8\right)+1$
$16x^2+24x-9$
$2x-5y=-3$
$\frac{d^2}{dx^2}\left(x^2+2xy-y^2=1\right)$
$4x^2+15x^2+36$
$\left(-e^{3x}\right)^2$
$-2y-xy+x^2-y$
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