5x-15-2x=6
3x=21
x=7
Therefore, x must equal 7.
Answer:
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I don't know about the first one but the second one is 34.9°. It would be that because are right angles add up to 90° and if you subract 55.1 and 90 it would equal 34.9. But this rule only works on right angles.
Answer: just multiply 9 and y together: 9 x y