x+102=4x+6
minus x both sides
102=3x+6
minus 6 both sides
96=3x
divide both sides by 3
32=x
x=32
we can't help you with the angles if you don't give us the relation
but we do know that
the exterior angle= the sum of the other 2 interior angles oposite that angle
so I'm guessing that the exterior angle is 4x+6 and the interior angles are x and 102
not sure
but x=36