$\frac{x^2+125}{x+5}=x^2-5x+25$
$-19\left(-18-3b\right)+15b$
$y ^ { 2 } = \frac { x - 1 } { x + 1 }$
$z-z$
$mn\left(2x-3y-4z\right)$
$sin\left(5x\right)=0$
$\int\left(8x^4\left(x^5-7\right)^6\right)dx$
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