Срочно! Помогите пожалуйста:*
Упростите выражение:
А) (x+3)/x - x/(x-3) + 9/(x^2-3x)=
Б) 3/(y+5) - 2/(y-5) + 30/(y^2-25)
B) (b+c)/b^2-bc - 4b/(b^2-c^2) - (b-c)/(b^2+bc)
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