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r in (-oo:+oo)
r/10 = 14/8 // - 14/8
r/10-(14/8) = 0
r/10-7/4 = 0
1/10*r-7/4 = 0 // + 7/4
1/10*r = 7/4 // : 1/10
r = 7/4/1/10
r = 35/2
r = 35/2
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