Find the fourth term of the recursively defined infinite sequence. 
Definitions:
Substitution
A method of replacing a variable with a value or another expression.
Equations
Mathematical statements that assert the equality of two expressions, often involving one or more variables.
Elimination
A method in algebra for solving systems of equations, removing one variable at a time to find their values.
Linear Equations
Equations between two variables that produce a straight line when graphed.
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