How old am I if 400 reduced by twice my age is 244?

My age is 78 years.

Define my age first as a variable. Let my age be ##x## years.

Reduced by means subtracted. Subtract twice my age from 400 to get 244:

##400 - 2x = 244##

##400-244 = 2x" "larr## make x positive and isolate it.

##156 = 2x##

##78 =x##