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calculusxy
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3912=27
27/2=13.5

♪Chibiterasu
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2r + 12 = 39
39  12 = 2r
27 = 2r
27/2 = r
18.5 = r
Test it out:
2(18.5) + 12 = 39
27 + 12 = 39
39 = 39
r equals 18.5

leroysgurl15
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the answer would be 13.5 the way to get that is dw:1380236489355:dw

♪Chibiterasu
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Ah yes, it is. Ugh, I got confused xD
Yes, it is 13.5 my bad.

dejavo
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R =27/2

♪Chibiterasu
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which is 13.5 >.>

dejavo
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ok and nobody asked for the attitude or your comment