exam Maths Puzzle Numerical Ability

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

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exam Other Question

how do you evaluate the following expression:
log base square root 2 (2 sqaure root 2) Mary took 5 English tests. Her scores were 78%, 89%, 98%, 67%, and 90%.
What must she score on her sixth test so her average will be 85%?