129=3(-7n+8)

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Solution for 129=3(-7n+8) equation:


Simplifying
129 = 3(-7n + 8)

Reorder the terms:
129 = 3(8 + -7n)
129 = (8 * 3 + -7n * 3)
129 = (24 + -21n)

Solving
129 = 24 + -21n

Solving for variable 'n'.

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

Add '21n' to each side of the equation.
129 + 21n = 24 + -21n + 21n

Combine like terms: -21n + 21n = 0
129 + 21n = 24 + 0
129 + 21n = 24

Add '-129' to each side of the equation.
129 + -129 + 21n = 24 + -129

Combine like terms: 129 + -129 = 0
0 + 21n = 24 + -129
21n = 24 + -129

Combine like terms: 24 + -129 = -105
21n = -105

Divide each side by '21'.
n = -5

Simplifying
n = -5

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