7/(x-y)(x+y) - 2/x(y-x) - 12/x(x+y) = (7x+2x+2y-12x+12y)/x(x-y)(x+y) = (-3x+14y)/x(x-y)(x+y)
"/" использовала как дробя
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7/(x-y)(x+y) - 2/x(y-x) - 12/x(x+y) = (7x+2x+2y-12x+12y)/x(x-y)(x+y) = (-3x+14y)/x(x-y)(x+y)
"/" использовала как дробя