exam Maths Puzzle Numerical Ability

Solve and check each of the following for X:

A: (x/3)-2=1

B: (x/6)-(x/8)=1

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exam Other Question

I don't know how to solve this matrices, can you please show me the steps involved and explain how the changing of rows works and when to do it, and the number used to multiply a r what is the slope of the line that bisects the 90 degrees angle betweeb the +x and +y axes? between the -x and +y axes?