x+4 / x-4 = a+b+4 / a+b-4
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Use componendo and Dividendo
x + 4 + x - 4 a + b + 4 + a + b - 4
_________ = ______________
x + 4 - x + 4 a + b + 4 - a - b + 4
2x 2a + 2b
__ = _____
8 8
x = a + b
x + 4 + x - 4 a + b + 4 + a + b - 4
_________ = ______________
x + 4 - x + 4 a + b + 4 - a - b + 4
2x 2a + 2b
__ = _____
8 8
x = a + b
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