Anyone want to help me with this? I will mark brainliest and thanks

x = -8

m∠BDC = 68°

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Geometry

Definition of a Line: A line is 180°

Step-by-step explanation:

Step 1: Set up Equation

m∠BDC + m∠CDA = 180°

(-7x + 12)° + (-8x + 48)° = 180°

Step 2: Solve for x

Combine like terms:                    -15x + 60 = 180Isolate x term:                              -15x = 120Isolate x:                                       x = -8

Step 3: Find m∠BDC

Define:                    m∠BDC = (-7x + 12)°Substitute in x:       m∠BDC = (-7(-8) + 12)°Multiply:                  m∠BDC = (56 + 12)°Add:                        m∠BDC = 68°