-7z+21=-42

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Solution for -7z+21=-42 equation: 


Simplifying
-7z + 21 = -42

Reorder the terms:
21 + -7z = -42

Solving
21 + -7z = -42

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 = -42 + -21

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

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

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

Simplifying
z = 9

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