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= 9/12+6/12+4/12
= 19/12
= 1 7/12 (C)
20) 3x = 3/4x+6
3x-3/4x = 6
2 1/4x = 6
2 1/4 = 9/4
x = 6÷9/4
= 2 2/3 (B)