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x in (-oo:+oo)
(1/3)*x+8 = 6*x+236/21 // - 6*x+236/21
(1/3)*x-(6*x)-(236/21)+8 = 0
(1/3)*x-6*x-236/21+8 = 0
-17/3*x-68/21 = 0 // + 68/21
-17/3*x = 68/21 // : -17/3
x = 68/21/(-17/3)
x = -4/7
x = -4/7
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