$7x\ge-21$
$x^4-6x^3+5x^2$
$\:-6\left(5d+5\right)+5\left(2d+9\right)$
$\left(-4x+7\right)^2$
$\frac{1-2x-x^2}{x+1};\:x=-3$
$\left(-7x-4y+6z\right)+\left(-10x-20y-8z\right)+\left(-5x+24y+2z\right)$
$\left(x^2y^{-1}\right)^2^{-3}$
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