$4ab+2a^2+a^2-4ab+4b^2$
$3x+38-4x+39$
$\left(x^3+4x^2-6x^2-4x+8\right)$
$104\cdot25$
$12x\frac{-2x+3}{4}$
$\frac{x^2+3xy}{x-2y}$
$3x^2+9x-54$
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