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(1/3)*x+8 = 140/27-6*x // - 140/27-6*x
(1/3)*x-(-6*x)-(140/27)+8 = 0
(1/3)*x+6*x-140/27+8 = 0
19/3*x+76/27 = 0 // - 76/27
19/3*x = -76/27 // : 19/3
x = -76/27/19/3
x = -4/9
x = -4/9
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