$2x-3y-z+2w+3v=4$
$10^{x-3}=1$
$-6+9+3-6+4-1+5-3+6$
$12a^2b+3ab^28a^2b-10ab^2-3a^2b+6ab^2$
$7x^2-15x+7=0$
$\lim_{x\to0}\left(\frac{7\:cos\left(-0.001\right)-7\:}{-0.001}\right)$
$\left(6y^2-9y+4\right)-\left(-7y^2+5y+1\right)$
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