4z-7z=-21

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Solution for 4z-7z=-21 equation: 


Simplifying
4z + -7z = -21

Combine like terms: 4z + -7z = -3z
-3z = -21

Solving
-3z = -21

Solving for variable 'z'.

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

Divide each side by '-3'.
z = 7

Simplifying
z = 7

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