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