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r in (-oo:+oo)
(1/5)*r-26 = (1/2)*r-29 // - (1/2)*r-29
(1/5)*r-((1/2)*r)-26+29 = 0
(1/5)*r+(-1/2)*r-26+29 = 0
3-3/10*r = 0 // - 3
-3/10*r = -3 // : -3/10
r = -3/(-3/10)
r = 10
r = 10
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