elenear is three years older than herb. in twelve years the sum of their ages will be 51. how old is herb today?

Question

i did this so far but i don't know what to do next?

let x represent herb's age
x+3 represent elenear's age

x+12+x+3+12= 51

Answer 1

try this
x=3+h
x+12+(h+12)=51
(3+h+12)+h+12=51
solve for h

Answer 2

assarif
your equation is correct
solve it to get x=12

which checks out