exam Maths Puzzle Numerical Ability

x = 4-4y
-x + 2y =2

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Hi!
So the solution is to solve
2
- (36x-6)=68
3
I tried solving this by doing the 5-step method, the problem is just to difficult for me to answer, please help me Thank You My question is combination word problem and cost function. I struggle a lot with these. Please assist.
In the following, a cost function is given. Find the average cost per item