Explanation:
14x-3=4x+13+6x+2(sum of two interior angle is equal to exterior)
14x-4x-6x=13+2+13
4x=28
x=28/4
x=7
14x-13=14*7-13=85
4x+13=4*7+13=85
6x+2=6*7+2=44
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