21-13z-7z=9

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


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

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

Solving
21 + -20z = 9

Solving for variable 'z'.

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

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

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

Combine like terms: 9 + -21 = -12
-20z = -12

Divide each side by '-20'.
z = 0.6

Simplifying
z = 0.6

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