$\left(d+4\right)-4$
$+5-8+9-4.5-6$
$\lim_{x\to\infty}\left(\frac{2x\:+\:3x^3-\:5x^2}{e^x\:-\:4x^3\:+\:2x}\right)$
$x^3-6x^2-7x$
$3x+5a-2x+3a$
$\sin^2x+\cos\left(2x\right)=\cos^2x$
$xy'+4y=0$
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