This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
21
Step 1: Use the identity . Given . We can rewrite as .
Step 2: Equate the angles since the cosine values are equal.
Step 3: Solve for . Add to both sides: Add to both sides: Divide by :
Step 4: Check if the value of is within the given range . Since , and , the value is valid.
The value of is .
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Use the identity = (90^ - ). Given (5x-28)^ = (3x-50)^.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.