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A. 8 - x = 10x - 14
8 - 2 = 10(2) - 14
6 = 20 - 14
6 = 6 (benar)
B. 3x + 5 > 3 + 5x
3(2) + 5 > 3 + 5(2)
6 + 5 > 3 + 10
11 > 13 (salah)
C. Benar, X = 2 merupakan bilangan prima
D. Benar, sudut persegi ada 2x = 2(2) = 4 sudut