$32\:+\:54+\:\left(-\:72\right)\:+\:\left(-\:12\right)\:+\:80\:+\:90\:+\:\left(-\:160\right)$
$9x^2+18x+170=0$
$\frac{d^2x}{dt^2}=-2$
$\left(-2a+b\right)-\left(-a+b-c\right)+a$
$\left(8x^3+3x^2y\right)^2$
$\frac{dy}{dx}=\frac{2x-8xy}{x^2+4}$
$-6-a+5+2a$
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