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3x = 18
x = 6
Nilai x dimasukin ke persamaan :
3x - 6 = 3 (6) - 6 = 12.
25. 12 - 2(x+1) > (2x+1) -7
12 - 2x - 2 > 2x + 1 -7
10 - 2x > 2x - 6
- 4x > - 16
- x > -4
x < 4