Use the method of substitution to solve the system. 
Definitions:
Proposal
A formal suggestion or plan put forward for consideration or discussion by others.
Proposal
A formal suggestion or plan, often detailed in a document, presented for consideration or action.
Review
The process of examining something with the possibility of making changes based on the assessment.
Situation
A set of circumstances or a state of affairs at a particular time or in a particular place.
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