Given [ m ∠ ABD = 70° ], [ m ∠ CBD = 5x + 13° ], [ m ∠ ABC = 3x + 33° ], find [ m ∠ ABC ]:

a) ( x = 5 )
b) ( x = 7 )
c) ( x = 10 )
d) ( x = 15 )