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(2(4*x-8)+3*x)-(11*x+1-9)
(2*(4*x-8)+3*x)-(11*x+1-9)

(2*(4*x-8)):
push 2
...
push 8
op -; now 4*x-8 is last on stack
op * ; now result is last thing on stack

 2(4x-8)+3x=11x+1-9