Hi

(7x+6) + 10x  + Z = 180

   17x + 6 + Z = 180

             Z = 

Re TY:  Must be 'more to the story'

IF X = Z, yes, Z = 55° 

	Z	X	Y	X + Y + Z

x	174-17x	7X + 6	10X	

1	157	13	10	180

2	140	20	20	180

3	123	27	30	180

4	106	34	40	180

5	89	41	50	180

6	72	48	60	180

7	 	55	70	180

 

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