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r in (-oo:+oo)
r/7 = 3/2 // - 3/2
r/7-(3/2) = 0
r/7-3/2 = 0
1/7*r-3/2 = 0 // + 3/2
1/7*r = 3/2 // : 1/7
r = 3/2/1/7
r = 21/2
r = 21/2
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