Use the given information to write an equation. Let x represent the number described in the exercise. Then solve the equation and find the number.When 4 times a number is subtracted from 7 times the number, the result is 21. Find the number.
A. 4x + 7x = 21; 3
B. 4x(7 - x) = 21; -7
C. 7x - 4x = 21; 7
D. 4(x - 7) = 21x; 0.6
Answer: C
Mathematics
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