book Maths Puzzle Numerical Ability

Find all the solutions of the equation. Check your soulutions in the original equation.

x^4-x^3+x-1=0

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book Other Question

My questions says write the equation of a line that has a slope of 2/3 and passes through point (6,-3)
my answer is y=4-7=-3
is that right?
multiply:

5x+5/x-2*2x^2-8x+8/x^2-1