(x² + 2x - 3)/(x² - 1) * (4x + 4)/(x + 3) = (x + 3)(x - 1) /(x - 1)(x + 1) * (x + 1)/(x+3) = 4
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(x² + 2x - 3)/(x² - 1) * (4x + 4)/(x + 3) = (x + 3)(x - 1) /(x - 1)(x + 1) * (x + 1)/(x+3) = 4