129=42+9+3(2z)

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Solution for 129=42+9+3(2z) equation:


Simplifying
129 = 42 + 9 + 3(2z)

Remove parenthesis around (2z)
129 = 42 + 9 + 3 * 2z

Multiply 3 * 2
129 = 42 + 9 + 6z

Combine like terms: 42 + 9 = 51
129 = 51 + 6z

Solving
129 = 51 + 6z

Solving for variable 'z'.

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

Add '-6z' to each side of the equation.
129 + -6z = 51 + 6z + -6z

Combine like terms: 6z + -6z = 0
129 + -6z = 51 + 0
129 + -6z = 51

Add '-129' to each side of the equation.
129 + -129 + -6z = 51 + -129

Combine like terms: 129 + -129 = 0
0 + -6z = 51 + -129
-6z = 51 + -129

Combine like terms: 51 + -129 = -78
-6z = -78

Divide each side by '-6'.
z = 13

Simplifying
z = 13

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