Simplifying
$x^2-13x+40=0$
$\left(8y-12z\right)^2$
$23,5\cdot7,54$
$\sqrt[6]{9m^3n^2}$
$5y+8y=-39$
$\frac{3xy+6xy^2}{2xy+4yx^2}=\frac{dx}{dy}$
$h\left(x\right)=\left|-7+7\right|$
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