9z-15=-21+7z

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Solution for 9z-15=-21+7z equation:


Simplifying
9z + -15 = -21 + 7z

Reorder the terms:
-15 + 9z = -21 + 7z

Solving
-15 + 9z = -21 + 7z

Solving for variable 'z'.

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

Add '-7z' to each side of the equation.
-15 + 9z + -7z = -21 + 7z + -7z

Combine like terms: 9z + -7z = 2z
-15 + 2z = -21 + 7z + -7z

Combine like terms: 7z + -7z = 0
-15 + 2z = -21 + 0
-15 + 2z = -21

Add '15' to each side of the equation.
-15 + 15 + 2z = -21 + 15

Combine like terms: -15 + 15 = 0
0 + 2z = -21 + 15
2z = -21 + 15

Combine like terms: -21 + 15 = -6
2z = -6

Divide each side by '2'.
z = -3

Simplifying
z = -3

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