9z+21=8z+7

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Solution for 9z+21=8z+7 equation:


Simplifying
9z + 21 = 8z + 7

Reorder the terms:
21 + 9z = 8z + 7

Reorder the terms:
21 + 9z = 7 + 8z

Solving
21 + 9z = 7 + 8z

Solving for variable 'z'.

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

Add '-8z' to each side of the equation.
21 + 9z + -8z = 7 + 8z + -8z

Combine like terms: 9z + -8z = 1z
21 + 1z = 7 + 8z + -8z

Combine like terms: 8z + -8z = 0
21 + 1z = 7 + 0
21 + 1z = 7

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

Combine like terms: 21 + -21 = 0
0 + 1z = 7 + -21
1z = 7 + -21

Combine like terms: 7 + -21 = -14
1z = -14

Divide each side by '1'.
z = -14

Simplifying
z = -14

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