book Maths Puzzle Numerical Ability

How do I solve for x when :
((Square root)2x-3)= (squareroot(x+7))-2
?

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book Other Question

Solve the problem:

The printed matter on a 12 by 18 centimeter page of a book must cover 40 square centimeters. If all margins are to be the same width, how wide should the margins be? Can you help me solve:

6x-(4x-7)=9x-28