$x^2-3^2\left(x\right)-4$
$ax+bx+cx$
$\left(8z-2y+6x\right)\left(4z\right)$
$\left(5x^2+5x+3\right)\left(4x^3-3x-1\right)$
$x^2+2x+3>-12$
$49m^2-28m+4^2$
$-\frac{21}{3+4\left(-6\right)}$
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