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Step-by-step explanation:
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Answer: A. x=20°
B. x=20°
C. b=135°, a=45° c=135°
Step-by-step explanation: in question A, add x+x+3x+4x and solve by linear pair
In B, add 8x+x and solve by linear pair
In C, 45°=angle a(v.o.a), add 45° and angle b and solve by linear pair, angle b =angle c (v.o.a)