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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