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|2r + 9| = 5

So 2r + 9 = 5 or 2r + 9 = -5

so that 2r = -4 or 2r = -14

r = -2 or r = -7

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|2r + 9| = 5

So 2r + 9 = 5 or 2r + 9 = -5

so that 2r = -4 or 2r = -14

r = -2 or r = -7

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12-2r = 10

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4r2-25 = (2r)2-52 = (2r-5)(2r+5)

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2r-1=9 2r =10 r =5

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