3(7r-7)=

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Solution for 3(7r-7)= equation: 


Simplifying
3(7r + -7) = 0

Reorder the terms:
3(-7 + 7r) = 0
(-7 * 3 + 7r * 3) = 0
(-21 + 21r) = 0

Solving
-21 + 21r = 0

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 21r = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 21r = 0 + 21
21r = 0 + 21

Combine like terms: 0 + 21 = 21
21r = 21

Divide each side by '21'.
r = 1

Simplifying
r = 1

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