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x . 5 - 4 ≤ 12 + x
5x - 4 ≤ 12 + x
5x - x ≤ 12 + 4
4x ≤ 16
x ≤ 16 : 4
x ≤ 4
maka, nilai x adalah 4
X x 5 - 4 < 12 + x
5x - 4 < 12 + x
5x - x < 12 + 4
4x < 16
x < 4
X = (1,2,3,4)
semoga membantu (^_^)