$$((R+k)+(r+K))=((0 \times 26)+(7 \times { 10 }^{ 3 } ))+((0 \times 81)+(74+ { 10 }^{ 2 } ))$$
$K=7174-k-R-r$
$$R+k+r+K=0+7\times 10^{3}+0+74+10^{2}$$
$$R+k+r+K=0+7\times 1000+0+74+10^{2}$$
$$R+k+r+K=0+7000+0+74+10^{2}$$
$$R+k+r+K=7000+0+74+10^{2}$$
$$R+k+r+K=7000+74+10^{2}$$
$$R+k+r+K=7074+10^{2}$$
$$R+k+r+K=7074+100$$
$$R+k+r+K=7174$$
$$k+r+K=7174-R$$
$$r+K=7174-R-k$$
$$K=7174-R-k-r$$
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$R=7174-k-K-r$
$$R+r+K=7174-k$$
$$R+K=7174-k-r$$
$$R=7174-k-r-K$$
