exam Maths Puzzle Numerical Ability

Solve by elinimation
1/3x+2/1=2/1
2/3x-3/5y=1/5
Solve by elinimation
x-y=-13
9x-4y=-97
Solve by substitution
x+y=7
y=x-1

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exam Other Question
mÐ</font>1:mÐ</font>2 = 1:5. Find mÐ</font>2 x-{x-1-[x-2-(x-3-{x-4-[x-5-(x-6)]})]}