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Verified answer
2x² - x - 28 = 0(2x + 7)(x - 4) = 0
2x + 7 = 0
2x = -7
x1 = -7/2 = -3,5
x - 4 = 0
x2 = 4
2x1 + x2 = 2(-3,5) + 4 = -7 + 4 = -3