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3(4-x) = 12 - 3x y el otro es 18x + 5
12 - 3x > 18x + 5
12-5 >18x+3x
7 > 21x por (-1)
-7 < -21x
21x < 7
x < 7/21
x <1/3
CS = < -∞; 1/3 >