I'll do ya one better - 12 plus 8 equals what?
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3x - 12 = 10x - 15 - 6x -10 3x - 12 = 4x -25 3x + 13 = 4x 13 = 4x - 3x 13 = x None?
6
y = cx when x = 8, y = 12 so that 12 = 8c which gives c = 12/8 = 1.5
7x + 8 = 10x - 2 ∴ 3x = 10 ∴ x = 10/3
(2, 11)