960:(b+39)= 75-55
960:(b+39)= 20
(b+39) = 960:20
(b+39)=48
b= 48-39
b= 9
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960:(b+39)= 75-55
960:(b+39)= 20
(b+39) = 960:20
(b+39)=48
b= 48-39
b= 9