book Maths Puzzle Numerical Ability

{{{ 3(-2 - 3x)= -9x 4 }}}

and

{{{1/2 (6-z)=z }}}

and

{{{6+2(3j-2)= 4(1=j)

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book Other Question

x-3 over x-2 + x+1 over x+3 equals 2x squared +x+1 over x squared +x-6
for some reason my solution is x= -5 and in the andswer section of my book the solution is x= 6. am I right or wrong? The perimeter of a rectangular floor is 42 feet, and the area is 108 square feet. Find the length of the floor.