Question

example 5x+3-2x=7x+3

Answer 1

When you solve you equation, if it is an identity - some number equals itself - then it is always true. If when you solve it the answer is not true (5 = 8) for example, then it is never true. If you get your variable equal to something, then it is sometimes true, meaning that it is only true for specific values of that variable.

Answer 2

Work out the equation multiple times to decide whether if its true or not
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