602 - ( 173 + c × 6 ) = 375

Question

602 - ( 173 + c × 6 ) = 375

Answer 1

173+с*6=602-375
173+с*6=227
с*6=227-173
с*6=54
с=54:6
с=9
проверка
602-(173+9*6)=375
375=375

Answer 2

173+6c=602-375

173+6c=227

6c=227-173

6c=54

c=54:6
c=9