0=7z-13z-21

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Solution for 0=7z-13z-21 equation:


Simplifying
0 = 7z + -13z + -21

Reorder the terms:
0 = -21 + 7z + -13z

Combine like terms: 7z + -13z = -6z
0 = -21 + -6z

Solving
0 = -21 + -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.
0 + 6z = -21 + -6z + 6z
Remove the zero:
6z = -21 + -6z + 6z

Combine like terms: -6z + 6z = 0
6z = -21 + 0
6z = -21

Divide each side by '6'.
z = -3.5

Simplifying
z = -3.5

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