$x2-17x-50$
$\left(-8\right)\left(+6\right)-\frac{\left(-75\right)}{\left(+5\right)}$
$3x^2+2x-15$
$\left(a^2-\:a\:b\right)^2$
$\left(\left(1\right)\sqrt{2}-\left(-3\right)\sqrt{2}\right)$
$7x^2\:-\:7x\:-\:13\:=\:0$
$8x^2+13x-80$
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