$20 x ^ { 2 } - 8 x$
$\left(+1.496\right)\:-\:\left(-2.148\right)$
$7\left(-3a+8\right)$
$\:+4\:-\:7\:-8\:$
$\sqrt{36}+\:\sqrt{169}$
$\int\left(x\left(2x^2-1\right)\right)dx$
$15x^2-3x$
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