3(1+7x)=129

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


Simplifying
3(1 + 7x) = 129
(1 * 3 + 7x * 3) = 129
(3 + 21x) = 129

Solving
3 + 21x = 129

Solving for variable 'x'.

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

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

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

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

Divide each side by '21'.
x = 6

Simplifying
x = 6

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