exam Maths Puzzle Numerical Ability

2/3+1/4t=1/3

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Please help me in this problem:
99w^2x^3-81x^4=63w/-9wx

Thank you I would like to know if i did this problem correct. this problem is from a work sheet.
y=2x and y=2-1
_2=2(-1) and -2=-1-1