$3x-7y=-3y+7x$
$w=\sqrt{\frac{b}{2}}$
$6-4r+r^2=\:5$
$t^3\frac{dy}{dt}=3t^2y=e^{2t}$
$0,5x-3,2y+5,4x+6,4y+5,1x+4$
$\left(12x^3+7x^2+6x-8\right)-\left(9x^2-9+3x^4\right)$
$ax+4a+a+4x^2+6ax-5$
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