$x\:-\:4\:-\:7\:+\:8x$
$\frac{d}{dx}y=\sqrt{4-x}$
$-3y\:+\:3\:=\:-3y\:-\:6$
$-4+8-34-67+2$
$2sinx=\cos^2x+2$
$3a\:+\:6b$
$27x^3-3x$
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