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\begin{array}{crclcl}\text{1. Zeile:} & \sqrt[3]{x+1}+4 &=& 9 &\vert& -4 \cr \text{2. Zeile:} & \sqrt[3]{x+1} &=& 5 &\vert& ()^3 \cr \text{3. Zeile:} & x+1 &=& 125 &\vert& -1 \cr & x &=& 124 \;\in\;\mathbb{D}\end{array}