Please answer the clip above .
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Step-by-step explanation:
Given that ;
(55+ 3a) and ( 115-2a) are supplementary angles so their sum must be equal to 180degrees
( 55+3a)+(115-2a)=180
55+3a+115-2a =180
170+3a-2a=180
a=(180-170)°
a= 10°
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