$10-15+\left(-9\right)-\left(-15\right)-12$
$-4\left(-1\right)^2\left(\frac{1}{2}\right)$
$\left(x+2\right)\left(1-x\right)<0$
$\frac{y^3-1}{y-1}$
$0.675\left(20\right)\left(20\right)$
$\log\left(3x-y\right)=2\log\left(6\right)-\log\left(9\right)$
$y^'=\frac{y}{1+x^2}$
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