Kernel and image of a matrix mapping

Let \(L_A: \mathbb{R}^3\longrightarrow \mathbb{R}^3\) be the linear mapping determined by the matrix \[A=\matrix{-30 & 20 & 70 \\ 3 & -2 & -7 \\ -15 & 10 & 35 \\ }\tiny. \] Calculate a vector \(\vec{v}\) that spans the image of \(L_A\).

\(\vec{v}={}\)

#\cv{\Box \\ \Box \\ \Box}#