7x-15=-2
Move -15 to the rigjt side,
7x=-2+15
7x=13
Divide both sides by 7,
7x/7=13/7
x=13/7
This is the isosceles right triangle, the diagonal of a square, the thing that so upset the Pythagoreans. The two sides and diagonal of a square are in ratio
so we get

We could have also gotten this using Trig:


Or by recognizing u=v because remaining angle is 45 so this must be isosceles so



The table is ratio because he is a 5 sum place the ratio
We know that quadrilateral shapes(which this is) have angles that add up too 360. We know the angles 110, 50 and 90. Add them together and you get 250. 360-250=110
X=110