3(-7r+1)=129

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Solution for 3(-7r+1)=129 equation:


Simplifying
3(-7r + 1) = 129

Reorder the terms:
3(1 + -7r) = 129
(1 * 3 + -7r * 3) = 129
(3 + -21r) = 129

Solving
3 + -21r = 129

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + -21r = 129 + -3

Combine like terms: 3 + -3 = 0
0 + -21r = 129 + -3
-21r = 129 + -3

Combine like terms: 129 + -3 = 126
-21r = 126

Divide each side by '-21'.
r = -6

Simplifying
r = -6

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