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To solve for x, we can use the fact that the sum of angles in a linear pair is 180°.
So, the equation that will solve for x is:
mL1 + mL4 = 180°
Substituting the given values, we have:
125° + (x + 35)° = 180°
Simplifying the equation:
160° + x° = 180°
Subtracting 160° from both sides:
x° = 20°
Hence, the equation that will solve for x is x = 20°.