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101+x = 17 × 7
101+x= 119
x= 119-101
x= 18
2. {7+(x-3)+10+(x-5)} : 4 = 15
2x+9 = 60
2x = 51
x = 51/2 = 25,5
data ⇒ 7 ; (x-3) ;10 ; (x-5)
7 ; (25,5-3) ; 10 ; (25,5-5)
7 ; 22;5 ;10 ; 20,5
data setelah diurutkan ⇒ 7 ; 10 ; 20,5 ; 22,5
mean ⇒ (10+20,5) : 2 = 30,5 : 2 = 15,25
maaf kalau ternyata jawabannya salah.