exam Maths Puzzle Numerical Ability

in this equation i need to use substitution!!
please help me!!!
thank you!

y=3x
x=2y=-21

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I would appreciate help with this problem. Thank you!
http://img115.imageshack.us/my.php?image=geometryquestion1pw7.jpg 4-3(2b+4) = 6-2(3b-1)