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not equalsign =. Consider the result of substituting x=1 into the equation. Some equations are impossible to solve. Consider the following example.
Value of x | Substitute | Are both sides equal? |
---|---|---|
5 | 5−5=?3 | 0=3 × |
6 | 6−5=?3 | 1=3 × |
7 | 7−5=?3 | 2=3 × |
8 | 8−5=?3 | 3=3 ✓ |
As shown in the table, the only solution of the equation is 3.