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r in (-oo:+oo)
2*r-(3/(-7)) = 5 // - 5
2*r-(3/(-7))-5 = 0
2*r+3/7-5 = 0
2*r-32/7 = 0 // + 32/7
2*r = 32/7 // : 2
r = 32/7/2
r = 16/7
r = 16/7
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