5z+21-12z=63

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Solution for 5z+21-12z=63 equation:


Simplifying
5z + 21 + -12z = 63

Reorder the terms:
21 + 5z + -12z = 63

Combine like terms: 5z + -12z = -7z
21 + -7z = 63

Solving
21 + -7z = 63

Solving for variable 'z'.

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

Add '-21' to each side of the equation.
21 + -21 + -7z = 63 + -21

Combine like terms: 21 + -21 = 0
0 + -7z = 63 + -21
-7z = 63 + -21

Combine like terms: 63 + -21 = 42
-7z = 42

Divide each side by '-7'.
z = -6

Simplifying
z = -6

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