Solve the linear equations and check the solution :

Solve the linear equations and check the solution :

Solve the linear equations with absolute value and check the solution :

Solve the linear equations with variables in numerator and denominator, check the solution and determine the conditions of solvability :

Solve the linear equations with a parameter *a*∈**R** :

Solve the linear inequalities :

Solve the linear inequalities with absolute value :

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