[tex] {m}^{ - 53} [/tex]
1) Use quotient rule:
[tex]\frac{ {x}^{a} }{ {x}^{b} } = {x}^{a - b} [/tex]
2) Simply
[tex]8 - 61 \: \: to \: - 53 = {m}^{ - 53} [/tex]
