$3x^4+15x^2=\:0$
$-82bx-71bx-53bx+20bx$
$4wx+2wz+6vx+3vz$
$3\cdot10^8\cdot5\cdot10^2$
$3x^2-5x^2-5x+844$
$2x+21=3x-6$
$\frac{3x^4+8x^2-7x+4}{x-2}$
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