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r in (-oo:+oo)
3*r-(2/5) = 6 // - 6
3*r-(2/5)-6 = 0
3*r-2/5-6 = 0
3*r-32/5 = 0 // + 32/5
3*r = 32/5 // : 3
r = 32/5/3
r = 32/15
r = 32/15
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