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3x - 5 = 7
3x = 7 + 5
3x = 12
x = 12/3
x = 4
3x - 5 = -7
3x = -7 + 5
3x = -2
x = -2/3
jadi, x = 4 atau x = -2/3
3x-5 = 7
3x = 7+5
3x = 12
x = 4
atau
3x-5 = -7
3x = -7+5
3x = -2
x = -2/3
HP = {-2/3 , 4}