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
90
Step 1: Identify the relationship between the given angles. The two angles, and , are vertically opposite angles. Vertically opposite angles are equal.
Step 2: Set up the equation.
Step 3: Solve for . Subtract from both sides: Add to both sides:
The value of is .
Step 4: Verify the angles (optional). If : First angle: Second angle: The angles are equal, so the value of is correct.
The value of is .
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Identify the relationship between the given angles. The two angles, 4m - 15 and 3m + 75, are vertically opposite angles.
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.