a decagon has interior angles with measures in degrees of 15

a decagon has interior angles with measures in degrees of 157 128 155 162 169 131 155 168 x and2 x find the value of x

Average angles of an Decagon =144 degrees

157+128+155+162+169+131+155+168+x+2x/10= 144

1225+3x/10= 144

1225+3x=1440

3x=144--1225

3x=215

x=215/3

x=71.67

2x= 2*71.67=144.34