book Maths Puzzle Numerical Ability

7x-5-5x=15

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MY QUESTION IS FOR A FRIEND OF MINES DAUGHTER. I AM NOT SURE I HAVE ALL OF THE INFO FOR THE PROBLEM, BUT THIS IS WHAT I HAVE : G+(20+12)=

THAT'S IT SO IF YOU COULD HELP US THAT
Here is my first problem:

The Scott Paper Company wishes to make a closed rectangular box that uses 173 square inches of material. If the base must have a length that is 2.1 tim