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If: x/3 + 10 = 15 Then: x = 15
x=3 cross multiply and you get 15x=45 then divide 45 by 15 and you get 3
If the question is, What x 3 equals 15? Then 5 x 3 = 15 If the question is, What is 15 x 3? Then 15 x 3 = 45
x over 4= 2x+3 over 15
3 over 5 is the same as 9 over 15 so x = 7 over 15.