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r in (-oo:+oo)
(1/3)*(r-4) = 10 // - 10
(1/3)*(r-4)-10 = 0
1/3*(r-4)-10 = 0
1/3*(r-4)-10 = 0
1/3*r-34/3 = 0
1/3*r-34/3 = 0
1/3*r-34/3 = 0 // + 34/3
1/3*r = 34/3 // : 1/3
r = 34/3/1/3
r = 34
r = 34
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