$3\mathrm{.}121$ As an adjustable brace $BC$ is used to bring a wall into

plumb, the force$-$couple system shown is exerted on

the wall. Replace this force$-$couple system with an

equivalent force$-$couple system at $A$ if $R=21\mathrm{.}2N$ and

$M=0\mathrm{.}1325N*m.$

Fig. P$3\mathrm{.}121$