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12 = 4 . (5x - 7)
12 = 20x - 28
12 + 28 = 20x
40 = 20x
x = 40 ÷ 20 = 2
12 = (5x - 7) 4
12 = 20x - 28
12 + 28 = 20x
40 = 20x
x = 40/20
x = 2