$15x^2-10x=0$
$\left(3xy\right)\left(2x^2-xy+2y\right)\:\:$
$2a+5a-a$
$\left(2a^3+5a-3\right)-\left(2a^3+3a^2-4a\right)$
$\lim_{x\to3}\left(\frac{x-3}{\sqrt{x+1}-2}\right)$
$6\sin\left(3x\right)+1=7$
$\left(e^{2x}\right)\left(4x+10\right)$
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