Question:
I am going to buy exotic fruits.  Dragonfruit costs $x-4$ dollars.  Starfruit is five dollars less expensive than rambutan.  Rambutan costs $2x$ dollars more than dragonfruit.  How much does it cost to buy one rambutan, two starfruit, and three dragonfruit? Your answer will be an expression that depends on $x$.

Answer:
We know that one dragonfruit is $x-4$ dollars.  This means that one rambutan is $(x-4) + 2x = 3x-4$ dollars.  Then, one starfruit is $(3x-4) -5 = 3x-9$ dollars. We want to find $1 \cdot (3x-4) + 2 \cdot (3x-9) + 3 \cdot (x-4)$.  Distributing these three smaller expressions gives us $(3x-4) + (6x-18) + (3x-12)$. Finally, we combine like terms, yielding $(3x + 6x + 3x) + (-4 + -18 + -12) = (12x) + (-34)$.  We obtain $\boxed{12x -34}$, or $\boxed{-34 + 12x}$.