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Simplifying
5r * r = 0
Multiply r * r
5r2 = 0
Solving
5r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Divide each side by '5'.
r2 = 0
Simplifying
r2 = 0
Take the square root of each side:
r = {0}
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