Question 192973
remember  the  sum  if  angles  of  a  triangle  =180 deg

gives  angles  of,, x,x,(x+30)

sum  =  3x +30=180
subt  30  both  sides
3x=180-30=150
divide  both  sides  by  3
x=50

answer,  sides  of  50,50,80

check  50+50+80=180  ok

80-50=30  ok