7z-4=13+z+8

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Solution for 7z-4=13+z+8 equation:


Simplifying
7z + -4 = 13 + z + 8

Reorder the terms:
-4 + 7z = 13 + z + 8

Reorder the terms:
-4 + 7z = 13 + 8 + z

Combine like terms: 13 + 8 = 21
-4 + 7z = 21 + z

Solving
-4 + 7z = 21 + z

Solving for variable 'z'.

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

Add '-1z' to each side of the equation.
-4 + 7z + -1z = 21 + z + -1z

Combine like terms: 7z + -1z = 6z
-4 + 6z = 21 + z + -1z

Combine like terms: z + -1z = 0
-4 + 6z = 21 + 0
-4 + 6z = 21

Add '4' to each side of the equation.
-4 + 4 + 6z = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 6z = 21 + 4
6z = 21 + 4

Combine like terms: 21 + 4 = 25
6z = 25

Divide each side by '6'.
z = 4.166666667

Simplifying
z = 4.166666667

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