Вот держи ответ........
7x² + 28x - (x + 4) = 0
7x² + 28x - x - 4 = 0
7x(x + 4) - (x + 4) = 0
(x + 4) (7x - 1 ) = 0
x + 4 = 0; x = -4
7x - 1 = 0; x =1/7
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Вот держи ответ........
7x² + 28x - (x + 4) = 0
7x² + 28x - x - 4 = 0
7x(x + 4) - (x + 4) = 0
(x + 4) (7x - 1 ) = 0
x + 4 = 0; x = -4
7x - 1 = 0; x =1/7