(2x/x-7 + 7x/x²-14x+49) : 2x-7/x²-49 + 7(x+7)/x-7 = (2x/x-7+7x/(x-7)²) × x²-49/2x-7 + 7x+49/x-7 = 2x(x-7)+7x/(x-7)² × (x-7)(x+7)/2x-7 + 7x+49/x-7 = 2x²-14x+7x/x-7 × x+7/2x-7 + 7x+49/x-7 = 2x²-7x/x-7 × x+7/2x-7 + 7x+49/x-7 = x(2x-7)/x-7 × x+7/2x-7 + 7x+49/x-7 = x/x-7 × (x+7) + 7x+49/x-7 = x²+7x+7x+49/x-7 = x²+14x+49/x-7