book Maths Puzzle Numerical Ability

how do i solve using a graph for these types of problems? x^3-1=2x^2-3x
or y=2x+10-x^2

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book Other Question

3x+8+4x-x=26 The length of a rectangle is 8 inches more than twice its width. If the perimeter of the rectangle is 28 inches, find the width of the rectangle