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Answer to a math question 4+4

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Let f(x)=||x|−6|+|15−|x|| . Then f(6)+f(15) is equal to:
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Find the sum of the first 41 terms of the progression that begins: 32, 24, 16, …
solve for x 50x+ 120 (176-x)= 17340
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How to do 15 x 3304
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4+168×10³×d1+36×10³×d2=-12 -10+36×10³×d1+72×10³×d2=0
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Solve the following 9x - 9 - 6x = 5 + 8x - 9
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