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3x - 3 - 20 + 4x > 12 + 2x
3x + 4x - 3 - 20 > 12 + 2x
7x - 23 > 12 + 2x
7x - 2x > 12 + 23
5x > 35
x> 35/5
x> 7
Solución : ]7; + ∞[