[a^10 : a^2 * a^ 4 ]: [a^-1 * (a^7:a^7]=
=[a^(10-2+4):[a^(-1+0]
=a^12 : a ^-1 =
=a^(12-(-1))=
=a^(12+1)
=a^13
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[a^10 : a^2 * a^ 4 ]: [a^-1 * (a^7:a^7]=
=[a^(10-2+4):[a^(-1+0]
=a^12 : a ^-1 =
=a^(12-(-1))=
=a^(12+1)
=a^13