$20+90+5159w$
$\left(7x+7y\right)\left(6\right)$
$\left(2x-5y\right)\left(x+4y\right)$
$\int\left(\frac{1}{2}x\sin\left(3x\right)\right)dx$
$\int\frac{x^3}{\sqrt{a^2-x^2}}dx$
$6z^2+3x-18$
$\sqrt{x^2+14x+49}=8$
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