5x3y920x2y−2\frac{5x^3y^9}{20x^2y^{-2}}20x2y−25x3y9
2a+33+2a\frac{2a+3}{3+2a}3+2a2a+3
−4−6−5+4-4-6-5+4−4−6−5+4
x4 + 4x3 + 6x2 + ab+bx2+2x +1\frac{x^4\:+\:4x^3\:+\:6x^2\:+\:ab+b}{x^2+2x\:+1}x2+2x+1x4+4x3+6x2+ab+b
7x+8y−3b+2ab−3a+7b7x+8y-3b+2ab-3a+7b7x+8y−3b+2ab−3a+7b
x2−36x2+3x−18\frac{x^2-36}{x^2+3x-18}x2+3x−18x2−36
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