$-x\:+51\:=90$
$\left(-4uv^3\right)\:\left(3u^3v^4\right)$
$\lim_{x\to\frac{\pi}{2}}\left(4x^2-\pi\right)\cdot sec\left(x\right)$
$\left(2d^3\cdot2d\right)^2$
$\frac{8x^3-6x^2-27x+4}{4x-9}$
$\lim_{x\to\infty}\left(\frac{2x+1}{\left(x+4\right)^4}\right)$
$2-x\ge-10$
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