42=7z-21

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Solution for 42=7z-21 equation:


Simplifying
42 = 7z + -21

Reorder the terms:
42 = -21 + 7z

Solving
42 = -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.
42 + -7z = -21 + 7z + -7z

Combine like terms: 7z + -7z = 0
42 + -7z = -21 + 0
42 + -7z = -21

Add '-42' to each side of the equation.
42 + -42 + -7z = -21 + -42

Combine like terms: 42 + -42 = 0
0 + -7z = -21 + -42
-7z = -21 + -42

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

Divide each side by '-7'.
z = 9

Simplifying
z = 9

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