If (a + b + c + d) (a - b-c + d)
= (a + b-c-d) (a-b+c- d);
prove that: a: b = c : d.
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(a + b + c + d) (a - b-c + d)
= (a + b-c-d) (a-b+c- d);
prove that: a: b = c : d.
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