The equation *ax + b = *-5*x + b* has infinitely many solutions, where *a* and* b* are constants. What is the value of *a*?

**Maps to Category 10 of the book.**

**Answer posted on 08/29/2021: Answer is -5.**

For an equation to have infinitely many solutions, expressions on both side of the equation must be equal. Since the value of constant *b *is same on both sides, *a *must be -5.

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