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What is the solution of the inequality (x+1<2x-5)?

Answer and explanation

Correct answer: (x>6)

The direct answer is option A: x>6. An inequality compares two quantities, and its sign tells which side is larger. Start with x+1<2x-5. Subtract x from both sides: 1<x-5. Add 5 to both sides: 6<x, which is the same as x>6. Addition and subtraction do not reverse the sign. A is correct because it gives exactly all numbers greater than 6; for example, x=7 works. B, x<6, is the opposite direction and fails for x=7. C, x≥6, incorrectly includes x=6, but substituting 6 gives 7<7, which is false. D, x≤6, also has the wrong direction and includes values that do not satisfy the inequality. The endpoint 6 is excluded because the original sign is strict (<), not ≤. Memory cue: after isolating x, test one simple value such as 7 to confirm the direction.

Related tags

Linear InequalitiesVariables Both SidesGreater Result

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