book Maths Puzzle Numerical Ability

The Eiffel Tower is 497 ft taller than the Washington Monument. If
each of the monuments were 58 ft shorter, the Eiffel Tower would be twice as
tall as the Washington Monument.

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Can you help me solve (((3x^4-28x^2+9=0))) Hi Tutors:

I undersand Absolute Value quite well, however I need some help with this problem. Can someone please help me understand this one. Thanks
2|2x-7|+11=25 Do I use the