Answers:
(1) r = 0
(2) The equation has no solution
Explanations:
(1) Given the expression:

Removing the brackets, we have:

Multiply both sides by 3

Collect like terms

Divide both sides by 48

(2) Given the expression:

Remove brackets

Collect like terms

Simplifying this, the variable k vanishes, leaving us with nothing to find. Therefore, the equation has no solution.