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m^{2}-m-2=m^{2}-10m+25+36
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(m-5\right)^{2}.
m^{2}-m-2=m^{2}-10m+61
Add 25 and 36 to get 61.
m^{2}-m-2-m^{2}=-10m+61
Subtract m^{2} from both sides.
-m-2=-10m+61
Combine m^{2} and -m^{2} to get 0.
-m-2+10m=61
Add 10m to both sides.
9m-2=61
Combine -m and 10m to get 9m.
9m=61+2
Add 2 to both sides.
9m=63
Add 61 and 2 to get 63.
m=\frac{63}{9}
Divide both sides by 9.
m=7
Divide 63 by 9 to get 7.