Answer:
49
Step-by-step explanation:
167 = 21 + (3x - 1)
167 = 20 + 3x
3x = 147
x = 49
Answer is 49
167=(3x-1)+21(Exterior angle is equal to two opposite interior angle)
or,167=3x-1+21
or,167=3x+20
or,167-20=3x
or,147=3x
or,x=147/3
or,x=49
