[tex] - 2x + 20 < 30 \\ - 2x < 30 - 20 \\ - 2x < 10 \\ x > - 5[/tex]
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resultado: x > –5
[tex] - 2x + 20 < 30 \\ - 2x < 30 - 20 \\ - 2x < 10 \\ x > - 5[/tex]