Break the question down by using Order of Operations. What is x times x? It's X2. What is X2+15? It's X2+15.
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find x+x+x when x=15 15+15+15=45
-2
15 x 6 + 0.5 x 6 = 93
15 x 3 = 45, 12 x 2 = 24, 45 + 24 = 69
1over3x+x+x+8+x=15