mathematics (Please answer :))

What is the measure of the smallest angle in the figure? The figure is not drawn to scale.
In this problem my test shows a 90 degree angle, and then for the other two angles, there are algebraic problems. Here are the problems. 6x - 7, and 4x - 3. My answer was 17, but I am so confused and I cannot find the correct value for x.
If someone could answer my question I would be very happy :)

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  1. a triangle has a total of 180º

    90 + 6x - 7 + 4x - 3 = 180

    10x = 100

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