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72x + 1 - 14x - 2 + 7 = 0
58x + 6 = 0
58x = - 6
x = - 6/58
72x + 1 - 14x - 2 + 7
72x - 14x - 2 + 1 + 7
58x - 1 + 7
58x + 6
jika, x dicari nilainya, maka :
58x= -6
x= -6/58