(a+b+c)² - (a-b+c)² =
= (a+b+c-a+b-c)(a+b+c+a-b+c) =
= 2b(2a+2c) = 4b(a+c)
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(a+b+c)² - (a-b+c)² =
= (a+b+c-a+b-c)(a+b+c+a-b+c) =
= 2b(2a+2c) = 4b(a+c)