Very simple inequation:

2 - x < 3

How to solve it?

The solutions tells me its S = ]-1, +\infty, but I can't get there

I hate Maths, and I haven't had an exam with Inequations in a long time

Expert Answers

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I do not know what you are getting as your answer, but I wonder if you might be forgetting to switch the inequality sign.  Lots of people make that mistake.

To do this equation, start as if it were an equality.  In other words, subtract 2 from both sides to leave only x on one side.

Now you have -x < 1

To make x positive, multiply both sides by -1.  When you do this, you must switch the direction of the inequality sign.

So now x > -1

So this means that the solution is -1 or any number higher than that.

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