book Maths Puzzle Numerical Ability

i am not quite sure if this is in the right cat. so i apologize ahead of time if it is not...
i have been havin alot of trouble with this problem....so any help would be appreciat

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0.5w=0.35(the answers are..........7, 0.7, 0.007, or none of these) Explain the difference between equivalent expressions and equivalent equations.

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