SOLUTION: Find x if the four angles of a quadrilateral are (5x-15),(3x-1)(5x-15) and (4x+34).

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Question 1015731: Find x if the four angles of a quadrilateral are (5x-15),(3x-1)(5x-15) and (4x+34).
Found 2 solutions by LinnW, fractalier:
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
A angles of quadrilateral = 180 degrees
so (5x-15)+(3x-1)+(5x-15)+(4x+34)= 180
5x+3x+5x+4x-15-1-15+34 = 180
17x+3 = 180
add -3 to each side
17x = 177
divide each side by 17
x = 177/17

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Since the angles of every quadrilateral add up to 360, we have
(5x-15)+(3x-1)+(5x-15)+(4x+34)=360
17x + 3 = 360
17x = 357
x = 21