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4x - 12 < x +3
4x - x < 3 + 12
4x < 15
x < 15/4
x < 3,75
d) 2(5x - 2 1/2) < 5(x + 3)
10x - 4 1/2 < 5x + 15
10x - 5x < 15 + 4 1/2
5x < 30
x < 30/5
x < 6