$x^2+10x+25=36$
$\left(x+2x^2\right)\frac{dx}{dt}=\frac{1}{t}+1$
$\frac{64x^6-343y^9}{4x^2-7y^0}$
$0.100+0.010$
$-1+1-1+2$
$\lim_{x\to\infty}\left(9\cdot\:\frac{81-x^2}{\sqrt{x}-3}\right)$
$\left(7x-2\right)\left(2x+4\right)$
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