7z+21=10z-21

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Solution for 7z+21=10z-21 equation:


Simplifying
7z + 21 = 10z + -21

Reorder the terms:
21 + 7z = 10z + -21

Reorder the terms:
21 + 7z = -21 + 10z

Solving
21 + 7z = -21 + 10z

Solving for variable 'z'.

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

Add '-10z' to each side of the equation.
21 + 7z + -10z = -21 + 10z + -10z

Combine like terms: 7z + -10z = -3z
21 + -3z = -21 + 10z + -10z

Combine like terms: 10z + -10z = 0
21 + -3z = -21 + 0
21 + -3z = -21

Add '-21' to each side of the equation.
21 + -21 + -3z = -21 + -21

Combine like terms: 21 + -21 = 0
0 + -3z = -21 + -21
-3z = -21 + -21

Combine like terms: -21 + -21 = -42
-3z = -42

Divide each side by '-3'.
z = 14

Simplifying
z = 14

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