7z=4z+21

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Solution for 7z=4z+21 equation: 


Simplifying
7z = 4z + 21

Reorder the terms:
7z = 21 + 4z

Solving
7z = 21 + 4z

Solving for variable 'z'.

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

Add '-4z' to each side of the equation.
7z + -4z = 21 + 4z + -4z

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

Combine like terms: 4z + -4z = 0
3z = 21 + 0
3z = 21

Divide each side by '3'.
z = 7

Simplifying
z = 7

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