exam Maths Puzzle Numerical Ability

did I work this problem correctly

3(3x-1)=3x-2(3-x)

9x - 3= 3x - 6 + 2x
9x -3 =5x - 6
4x-3=-6
x=-.75

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exam Other Question
Solve the following systems by substitution
4x - 12y = 5
-x + 3y = -1 Im stuck on this problem.
It says solve

12/√(5x+6)=√(2x+5)

Thanks so much