exam Maths Puzzle Numerical Ability

I do not understand this problem because this problem has two variables

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exam Other Question

please help me find the linear equation of y=-x-1 Please help me to solve this problem, I have solved for x,but having trouble solving for y.

2/3x + 1/6y +2/3
-y = 12 - 2x

X = 2 2/3