$7x^2+49x-210$
$-0.6y+0.2y$
$15abc-12abc$
$\left(x-5y^5+2z^2\right)\left(2x-y^3-8z\right)$
$\frac{\left(50\cdot\left(-i\cdot1000\right)\right)}{\left(50-i\cdot\:1000\right)}$
$3x^2+4x+4-\frac{5}{3x-5}$
$\left(2x-\sqrt{y}\right).\:\left(2x+\sqrt{y}\right)$
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