Answer:
-1x = 27
Explanation:
5.x=5x
5.4=-20
7-(-20)=27
5x -4x=-1x
-1x=27
The answer to your question is: x = 27
The are vertical angles, so they measure the same:
4x + 7 = 5(x - 4)
4x + 7 = 5x - 20 Expanding
4x - 5x = -20 - 7 Simplify like terms
-x = -27
x = 27
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