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Verified Answer :

Tareki

2x + 1.5x +20 = 90 
3.5 x = 90-20 
3.5 x = 70 
x = 70/3.5 
x = 20 
angle DAE = 220 = 40 
angle CAD = 1.5
20 +20 = 50

Why are you learning geometry in elementary??