$x2-3x-55$
$3\left(2x+8\right)-12=3x+6$
$\left(-30\right):\:\left(6\right)\:-\:\left(3\right).\:\left(-2\right)$
$-17+20\left(-3\right)$
$2sinx\:+\:sin2x\:=0$
$\frac{\left(1-p\right)^2}{p}=9.9^{-3}$
$\left(-5x^2-4x-6\right)$
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