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in the adjoining figure
3x+5+7x+5 = 180°{ since cointerior angles adds up to 180°}
10x +10= 180°
10x= 180-10
10x=170
x=170/10
x=70°
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3x + 5 + 7x + 5 = 180° ( co-interior angles )
=> 10x + 10 = 180°
=> 10x = 170
=> x = 17
3x + 5 = 3 × 17 + 5
= 56°
7x + 5 = 7 × 17 + 5
= 124°
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