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12x - 66 = 3x + 9

12x - 3x = 9 + 66

9x = 65

x = 7.22

Check:

12(7.22) - 60 + 6 = 1(7.22) + 9 + 2(7.22)

86.64 - 66 = 7.22 + 9 + 14.44

20.64 = 30.66

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15y ago

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