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r in (-oo:+oo)
(-3/7)*r+3*r = (1/3)*r+47/3 // - (1/3)*r+47/3
(-3/7)*r+3*r-((1/3)*r)-(47/3) = 0
(-3/7)*r+3*r+(-1/3)*r-47/3 = 0
47/21*r-47/3 = 0 // + 47/3
47/21*r = 47/3 // : 47/21
r = 47/3/47/21
r = 7
r = 7
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