-3(5+8n)=129

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Solution for -3(5+8n)=129 equation: 


Simplifying
-3(5 + 8n) = 129
(5 * -3 + 8n * -3) = 129
(-15 + -24n) = 129

Solving
-15 + -24n = 129

Solving for variable 'n'.

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

Add '15' to each side of the equation.
-15 + 15 + -24n = 129 + 15

Combine like terms: -15 + 15 = 0
0 + -24n = 129 + 15
-24n = 129 + 15

Combine like terms: 129 + 15 = 144
-24n = 144

Divide each side by '-24'.
n = -6

Simplifying
n = -6

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