$900+200+-500$
$\frac{2+x}{x+1}=\frac{3}{4}$
$2^{x-1}+2^x+2^{x+1}=28$
$\sqrt{\frac{5ax}{125a^3x^2}}$
$\int t^3\:\left(t^4+5\right)dt$
$9a^4+36a^2+36b^2$
$6x\left(6x-2\right)+2x$
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