alleryFind x when 2(x + 3) = 20.
A7
B17
C8.5
D14
Answer & Solution
Correct answer: A. 7
1. Divide both sides by 2 to get x + 3 = 10.
2. Subtract 3 to get x = 7.
3. 17 forgets to divide and 14 doubles the answer.
_Source: Wikipedia, Elementary algebra, Linear equations with one variable_
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