$-3x\left(x-2\right)-2y\left(-2+x\right)^2$
$45\cdot13$
$\left(-\frac{-2+10y}{6}\right)^2$
$\left(2y-1\right)\left(2y-9\right)=4y^2-20y+9$
$4+3+5+2\:+4+4.24$
$x^2=19x-88$
$\frac{15a+20ab}{-5a}$
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