9=-7z-13z-21

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Solution for 9=-7z-13z-21 equation:


Simplifying
9 = -7z + -13z + -21

Reorder the terms:
9 = -21 + -7z + -13z

Combine like terms: -7z + -13z = -20z
9 = -21 + -20z

Solving
9 = -21 + -20z

Solving for variable 'z'.

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

Add '20z' to each side of the equation.
9 + 20z = -21 + -20z + 20z

Combine like terms: -20z + 20z = 0
9 + 20z = -21 + 0
9 + 20z = -21

Add '-9' to each side of the equation.
9 + -9 + 20z = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 20z = -21 + -9
20z = -21 + -9

Combine like terms: -21 + -9 = -30
20z = -30

Divide each side by '20'.
z = -1.5

Simplifying
z = -1.5

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