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2*³√x² - 3*³√x = 20
find x
To solve the equation 2³√x² - 3³√x = 20, we can a let y=³√x
2y^2-3y-20=0
then
2y+5=0
y-4=0
y=-5/2
or
y=4
then
x=4^3==64
x=(-5/2)^3=-125/8=15.625
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