x2 - x -12 = 0
x2 - 4x + 3x -12 = 0
x ( x -4) + 3 ( x -4) = 0
(x -4 ) ( x +3 ) = 0
x = 4 or x = - 3
5-15 6
15-25 11
25-35 21
35-45 23
45-55 14
55-65 5
Multiple
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