(x+3)^3=343, find the value of x^3

(x+3)^3=343, find the value of x^3

$$\begin{array}{rcl} (x+3)^3 & = & 343 \quad | \quad \sqrt[3]{} \\ x+3 & = & \sqrt[3]{343} \\ x+3 & = & \sqrt[3]{7^3} \\ x+3 &=& 7 \quad | \quad -3\\ x &=& 4 \\ x^3 &=& 4^3 \\ x^3 &=& 64 \end{array}$$