To solve the equation \( \frac{14}{7 - x} = 3 \), we want to isolate the variable \( x \).
Let's look at the options provided:
A. Subtract 7 from both sides of the equation.
B. Multiply both sides of the equation by \( 7 - x \).
C. Divide 14 by 7 to get \( 2 - x = 3 \).
D. Add \( x \) to both sides of the equation.
The best first step to eliminate the fraction is option B: Multiply both sides of the equation by \( 7 - x \).
This allows you to eliminate the denominator and simplify the equation, making it easier to solve for \( x \). Thus, option B is the correct first step.