You should use your calculator for such simple sums. It is far quicker and involves fewer key depressions than posting the question on WA. But since you seem unable to carry out even this simple task, the answer is 270
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3-6x=15 or,6x=3+15 or,6x=18 or,x=18/6 or,x=3 [Ans].
x = -1 Since -3(-1) + 15 = 18
If x-3x=18 then x equals -9
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