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x/2 + 2x - x <=3 + 1/4
3/2 x <= 13/4
x <= 26/12 que simplificado es: x <= 13/6
4+2x ≤ 2x+x+3
4+2x ≤ 3x+3
4-3 ≤ 3x-2x
1 ≤ x