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=) (3x+20)°+(4x-36)°=180°
=)3x+20+4x-36=180
=)5x-16=180
=)5x=180+16
=)x=196÷5
=)x=39.2
Therefore, (3x+20)°
=(3×39.2+20)°
=(117.6+20)°
=137.6°
and,(4x-36)°
= like (3x+20)° do it
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