Answer:
x = 12
Step-by-step explanation:
We know that the total sum of the angles inside of a triangle is 180 degrees.
In other words, we can say that (4x-5) + (3x+11) + 90 = 180. From there, we can isolate x, and solve
(4x-5) + (3x+11) + 90 = 180
7x + 96 = 180
7x = 94
x = 12
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