a => 180°=3x-15+4x+2x-9
180°=9x-24
60° =3x-8
68°/3 =x
b. => 360° = 90°+ 102°+7y+5y+9y
360°-192°=21y
168° = 21y
168°/21= y
y = 8
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a => 180°=3x-15+4x+2x-9
180°=9x-24
60° =3x-8
68°/3 =x
b. => 360° = 90°+ 102°+7y+5y+9y
360°-192°=21y
168° = 21y
168°/21= y
y = 8