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-|x+1| =-2 /*(-1)
|x+1| =2
x + 1 = 2 lub x + 1 = -2
x = 1 lub x = -3
b). |3x-1| < 3
3x - 1 < 3 i 3x - 1 > -3
3x < 4 i 3x > -2
x < 4/3 i x > -2/3
x należy do przedziału (-2/3, 4/3)