d=16
d-10-(-2+1/2*d)=0
simplify
(d-10)-(-2+(1/2*d))=0
rewrite as an equivalent fraction
(using 2 as the denominator)
-2=-2/1=-2*2/2
adding fractions with common denominator
-2*2+d/2=d=4/2
(d-10)-(d-4)/2=0
rewrite the whole as a fraction using 2 as your denominator
d-10= d-10/1= (d-10)*2/2
d-16/2=0
get rid of the denominator
d=16/2*2=0*2
solve
d-16=0
d=16
