book Maths Puzzle Numerical Ability

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

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book Other Question

what is the soultion to this simultaneous equation using substion or addtion method?
2x+3y=-5
3x-y=20
how do i graph square roots and cubed roots? the question asks for the family name, the graph, the transformation, and the domain and range