three *(one + one /(three *x))^(one / three)*sign(three *x + one) - | three *x + one |/(nine *x^ two *(one + one /(three *x))^(two / three)) = zero
3 multiply by (1 plus 1 divide by (3 multiply by x)) to the power of (1 divide by 3) multiply by sign(3 multiply by x plus 1) minus module of 3 multiply by x plus 1| divide by (9 multiply by x squared multiply by (1 plus 1 divide by (3 multiply by x)) to the power of (2 divide by 3)) equally 0
three multiply by (one plus one divide by (three multiply by x)) to the power of (one divide by three) multiply by sign(three multiply by x plus one) minus module of three multiply by x plus one | divide by (nine multiply by x to the power of two multiply by (one plus one divide by (three multiply by x)) to the power of (two divide by three)) equally zero