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6x = -48
x = -8
4x + 20 = -2x - 28
4x + 2x = -28 - 20
6x = -48
x = - 8
nomor 2
6x + 6 < 2(8x - 4 )
6x + 6 < 16x - 8
6x - 16x < -8 - 6
-10x < -14
x < 14/10
x < 7/5
nomor 3
4(x+5) ≤ 5x + 12
4x + 20 ≤ 5x + 12
4x - 5x ≤ 12 - 20
-x ≤ -8
x ≤ 8