129=-3(5r-8)

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


Simplifying
129 = -3(5r + -8)

Reorder the terms:
129 = -3(-8 + 5r)
129 = (-8 * -3 + 5r * -3)
129 = (24 + -15r)

Solving
129 = 24 + -15r

Solving for variable 'r'.

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

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

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

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

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

Combine like terms: 24 + -129 = -105
15r = -105

Divide each side by '15'.
r = -7

Simplifying
r = -7

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