129=4r+3(3r-9)

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Solution for 129=4r+3(3r-9) equation:


Simplifying
129 = 4r + 3(3r + -9)

Reorder the terms:
129 = 4r + 3(-9 + 3r)
129 = 4r + (-9 * 3 + 3r * 3)
129 = 4r + (-27 + 9r)

Reorder the terms:
129 = -27 + 4r + 9r

Combine like terms: 4r + 9r = 13r
129 = -27 + 13r

Solving
129 = -27 + 13r

Solving for variable 'r'.

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

Add '-13r' to each side of the equation.
129 + -13r = -27 + 13r + -13r

Combine like terms: 13r + -13r = 0
129 + -13r = -27 + 0
129 + -13r = -27

Add '-129' to each side of the equation.
129 + -129 + -13r = -27 + -129

Combine like terms: 129 + -129 = 0
0 + -13r = -27 + -129
-13r = -27 + -129

Combine like terms: -27 + -129 = -156
-13r = -156

Divide each side by '-13'.
r = 12

Simplifying
r = 12

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