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-4 - 12 = -16
16/12 = 4/316/12 = 4/316/12 = 4/316/12 = 4/3
1/4 of 12 = 1/4 * 12 = 12/4 = 3
Think of fractions as division problems. 4 over 12 (4/12) is really just saying 4 divided by 12. Therefore, 4/12 = 4 divided by 12 = 0.3333 . . .
12 - (3^2 - 7) * 4 = 12 - (9 - 7) * 4 = 12 - 2 * 4 = 12 - 8 = 4