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120° = 6y
(opposite angles)
120/6=y
=> 20=y
: . y = 20
sum of angles of a figure = 360
let's imagine common angle = A
120 + 120 + (5x +10°) + A
=> (5x + 10)= A
240+ (5x + 10) + A
360 - 240
120
2A = 120
A =120 / 2
A = 60
(5x + 10) =60
5x = 60 - 10
5x = 50
x = 50/5
x = 10
x = 10
y = 20
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