AlgebraHardEquation with nested distribution
Algebra practice question
What value of x satisfies 5(3x − 4) − 2x = 71?
Answer: 7
15x − 20 − 2x = 71, so 13x = 91 and x = 7.
Common wrong answers
- If you answered 5
- 5 comes from 13x = 65, subtracting 20 from 91 a second time.
- If you answered 9
- 9 comes from 15x − 20 + 2x = 71 (wrong sign on the 2x term) and a rounding of 91/17.
- If you answered 3.9
- 3.9 comes from 13x = 51, subtracting 20 from 71 instead of adding it.
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