3r(7r)=

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Solution for 3r(7r)= equation: 


Simplifying
3r(7r) = 0

Remove parenthesis around (7r)
3r * 7r = 0

Reorder the terms for easier multiplication:
3 * 7r * r = 0

Multiply 3 * 7
21r * r = 0

Multiply r * r
21r2 = 0

Solving
21r2 = 0

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Divide each side by '21'.
r2 = 0

Simplifying
r2 = 0

Take the square root of each side:
r = {0}

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