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x - 2 = 0
x² + bx - 10 = 0
(x - 2)(x + 5) = 0
x² + 5x - 2x - 10 = 0
x² + 3x - 10 = 0
b = 3
-10 + 2b + 4 = 0
2b = 6
b = 3