7z-3=z+15

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Solution for 7z-3=z+15 equation:


Simplifying
7z + -3 = z + 15

Reorder the terms:
-3 + 7z = z + 15

Reorder the terms:
-3 + 7z = 15 + z

Solving
-3 + 7z = 15 + 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.
-3 + 7z + -1z = 15 + z + -1z

Combine like terms: 7z + -1z = 6z
-3 + 6z = 15 + z + -1z

Combine like terms: z + -1z = 0
-3 + 6z = 15 + 0
-3 + 6z = 15

Add '3' to each side of the equation.
-3 + 3 + 6z = 15 + 3

Combine like terms: -3 + 3 = 0
0 + 6z = 15 + 3
6z = 15 + 3

Combine like terms: 15 + 3 = 18
6z = 18

Divide each side by '6'.
z = 3

Simplifying
z = 3

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