find the coefficient of x³z⁴ in the expansion of (x-3z²)5
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x(1-3v+1)+3v=0
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3vx+3v=0
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x=-3v/3v
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x=-1
x(1-3v+1)+3v=0
______________
3vx+3v=0
______________
x=-3v/3v
______________
x=-1
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