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21x + 7 > 14x + 49
21x - 14x > 49 - 7
7x > 42
x > 6
Jadi, Hp = {7,8,9,...}
2.
Jadi, Hp = {1,2,3,...}
21x-14x = 49-7
7x = 35
x = 35 / 7
x =5
2x - 1/2 = 0
2x = 1/2
4x = 1
x = 1/4