$2x-1=4x+7$
$\left(2^a+x\right)^2$
$\lim_{t\to3}\left(\frac{t^{2}+4t-21}{t-3}\right)$
$\int\left(t^2\cos\left(t\right)\right)dx$
$\left(6n-33a\right)^2$
$7x-10x-9x$
$\lim_{x\to\infty}\left(\frac{2e^x+x^2}{e^x+5}\right)$
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