[(-13).(-13)] .x-72=16.10.x
\(\Leftrightarrow169x-72=160x\)
\(\Leftrightarrow9x=72\)
\(\Leftrightarrow x=8\)
\(\left[\left(-13\right).\left(-13\right)\right]x-72=16.10x\)
\(169x-72=160x\)
\(\Rightarrow169x-160x=72\)
\(\Rightarrow9x=72\)
\(x=8\)