x2+3x2=44\frac{x^2+3x}{2}=442x2+3x=44
72a2+93a3\frac{7}{2a^2}+\frac{9}{3a^3}2a27+3a39
x2x2−9\frac{x^2}{x^2-9}x2−9x2
4x2+5bx4x^2+5bx4x2+5bx
4+6+7+1904+6+7+1904+6+7+190
27b6−12u627b^6-12u^627b6−12u6
−1x2−4x-1x^2-4x−1x2−4x
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