$12x^3-90^2-24x+12$
$2-i+x=3+6i$
$x^2-8x-49=0$
$5b\left(y-3\right)-3a\left(-3+y\right)$
$x+3y+x+2x-y+2z$
$\frac{9-x^2}{x+2}$
$\int6x^3\left(x^4+2\right)^3dx$
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