$3x-3y+6x+4y+2x$
$\frac{-\frac{8t}{125}}{1+\frac{4}{125}\left(-t^2+16\right)^2}$
$x+12=3x+20$
$1+\cot\left(x\right)\tan\left(b\right)$
$y^2+10y+y^2$
$254.56\cdot2.5$
$\frac{3\pi}{4}+2\pi$
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