1/xy - (x2y2)/(x3y3), 3/(8a2xy) - (9x2y3)/(24a2x3y4), 1/(2x4y4z4) - (17x3y4z6)/(34x7y8z10), (-b3)/(5ax6) - (-12a2b8)/(60a3b5x6), (a4b9c10)/(3) - (21a8b10c12)/(63a4bc2), (3a4)/(4m7n8) - (75a7m5)/(100a3m12n8), (x-y)/(x+y) - (x2-y2)/(x2+2xy+y2), x+1 - (x2-2x-3)/(x-3), 1/(m2-n2) - (m2+n2)/(m4-n4), (a+4)/(a-2) - (a2-a-20)/(a2-7a+10),

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