How old am i if 400 reduced by 2 times my age is 230

Question

 Its an algebra homework question

Answer 1

400 reduced by   2 time    my age   is  230

400         -             2 ·          a          =  230           translate

400 - 2a = 230                                                     rewrite

-2a = -170           subtract 400 from both sides

a = 85                  divide both sides by -2