Answer:
x = 10
Step-by-step explanation:
supplementary angles
y + 6x - 15 = 180
triangle
(2x+18) + (2x-13) + y = 180
simplify the above to get these equations
y + 6x = 195
y + 4x = 175
solve for system of equations by subtracting the second from the first and you get
2x = 20
x = 10 degrees
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