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[tex](a + b)(a - b) = 7(a + b)[/tex]
Divide sides by ( a + b )
[tex] \frac{(a + b)(a - b)}{(a + b)} = \frac{7(a + b)}{(a + b)} \\ [/tex]
[tex](a - b) = 7[/tex]
[tex]a - b = 7[/tex]
