$x-2y+z=7$
$x^2+2x-120=0$
$\int\frac{1}{3}\left(x+a\right)dx$
$5mn-3n^3;\:m=3;\:n=2$
$x^6\cdot4x$
$\int\frac{2x^2+5x+1}{x^2+2x+1}dx$
$ax-c+bx-d=0$
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