book Maths Puzzle Numerical Ability

Can you help me solve:

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

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book Other Question

How do I solve for x when :
((Square root)2x-3)= (squareroot(x+7))-2
? If a woman can mow a yard with a lawn tractor in 2 hours, and another woman can mow the same yard with a push mower in 4 hours, how long will it take if they work together?