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r in (-oo:+oo)
(-6/7)*r+3*r = (1/3)*r+38/3 // - (1/3)*r+38/3
(-6/7)*r+3*r-((1/3)*r)-(38/3) = 0
(-6/7)*r+3*r+(-1/3)*r-38/3 = 0
38/21*r-38/3 = 0 // + 38/3
38/21*r = 38/3 // : 38/21
r = 38/3/38/21
r = 7
r = 7
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