Помогите решить!!! 7 класс
1) a/a-3 + 3/a+3 =
2)2/x+y - 2y/xy-x^2
3)(n^2-6n)*n*2/n*2-36
4)1/2x^2-4x : 1/2x^2+4x
5)3/x+2 + 3/x-2 + 12/4-x^2
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