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20 = 7 + 2x - 5 + x
20 = 3x + 2
18 = 3x
x = 6
20 = 7 + x + 2x - 5
20 = 2 + 3x
20 - 2 = 3x
18 = 3x
3x = 18
x = 6
Jawaban: D. 6