book Maths Puzzle Numerical Ability

Solve for x: x cubed - 4 cubed = 2x cubed - 7 cubed

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book Other Question

the question is:
graph the info by drawing tf in the y axis and tc in the x axis and plot the information on freezing and boiling temps as points on the graph.
and it gives us a
What is the domain of:

f(x) = x/xsquared + 3x - 4