Mathematics Knowledge第 47 / 120 题
If 3x + 7 = 22, what is the value of x?
a.3
b.7
c.5
d.9
解析
Subtracting 7 from both sides gives 3x equals 15. Dividing both sides by 3 gives x equals 5. You can check by substituting 5 back into the equation.
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