$6\:+\:3y^2\:-\:3y^2\:-\:3y\:+\:7y^2\:-\:3y\:-\:4$
$3x-2\left(x+1\right)=19$
$\frac{1}{1-sec\:x}+\frac{1}{1+sec\:x}$
$-x^2+2xy-3xy^2$
$-14m\cdot30$
$2x+y-3z=5$
$y=-\frac{1}{2}x^2+5x-8;\:x=-2$
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