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x(x + 2) - 4x(x + 2) = 0
(x + 2)(x - 4x) = 0
(x + 2)(- 3x) = 0
x + 2 = 0 lub - 3x = 0
x = - 2 lub x = 0
x * ( x + 2) = 4x * (x+2) = 1 * 2x = 4 * 2x = 8
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