15 x 5 = 75 You can just add up 15 5 times on a piece of paper and their you go! :)
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1 x 15, 3 x 5, 5 x 3, 15 x 1 = 15
If that's - 2x - 15, the answer is either (x - 5) or (x + 3)
x/5 = 3 Multiply both sides by '5' x = 15
3 x 5 = 15 15 x 6 = 90 Answer: 90
(6 x 5) / 2 = 3 x 5 so (30/2)=(3 x 5) 15=15