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4x - 30 > - 3x + 12
4x + 3x > 12 + 30
7x > 42
x > 42/7
x > 6
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6
Solución.
x∈ (6 , infinito)
4x+3x > 12 + 30
7x> 42
x > 42/ 7
x > 6
]6, +infinito[