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4 (x -3) < x + 3
4x - 12 < x + 3
4x - x < 3 +12
3x < 15
x < 15/3
x < 5
nomor 2
3x + 1 = 25 --x
3x + x = 25 -1
4x = 24
x = 24/4
x = 6
4x - 12 < x + 3
3x < 3 + 12
3x < 15
x < 5
3x + 1 = 25 - x
4x = 25 - 1
4x = 24
x = 6