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SAT Math Practice Exam

Category - Mathematics - Hard

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If (-7) (3/x+9)=0 and x≠7, then x=

-27
-3
-1/3
1/3
3

Explanation

Answer C - The equation has two factors on its left hand , one of these must be equal to zero .
As -7 is not zero , hence (3/x+9)=0 or 3/x = -9 or x = -3/9 = -1/3

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