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find x+x+x when x=15 15+15+15=45
1 x 15 = 15 2 x 15 = 30 3 x 15 = 45 4 x 15 = 60 5 x 15 = 75 6 x 15 = 90 7 x 15 = 105 8 x 15 = 120 9 x 15 = 135 10 x 15 = 150 11 x 15 = 165 12 x 15 = 180 13 x 15 = 195 14 x 15 = 210 15 x 15 = 225
-15. Here's how. X-15=2X Subtract X from both sides. -15=X. There you have it. X=-15.
154 = 15 x 15 x 15 x 15 = 50625
x-9 = 15 x = 15+9 x = 24