$4x^2+3x^3-8x^2$
$\frac{a^2+ab-ad-bd}{2a^2b+2a^2b}$
$41\cdot39$
$30d^2-60df+25f^2$
$61+23-15+17$
$1-64x^{3}$
$4x-3=5x+2$
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