4z-3z-21=2-2z

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Solution for 4z-3z-21=2-2z equation:


Simplifying
4z + -3z + -21 = 2 + -2z

Reorder the terms:
-21 + 4z + -3z = 2 + -2z

Combine like terms: 4z + -3z = 1z
-21 + 1z = 2 + -2z

Solving
-21 + 1z = 2 + -2z

Solving for variable 'z'.

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

Add '2z' to each side of the equation.
-21 + 1z + 2z = 2 + -2z + 2z

Combine like terms: 1z + 2z = 3z
-21 + 3z = 2 + -2z + 2z

Combine like terms: -2z + 2z = 0
-21 + 3z = 2 + 0
-21 + 3z = 2

Add '21' to each side of the equation.
-21 + 21 + 3z = 2 + 21

Combine like terms: -21 + 21 = 0
0 + 3z = 2 + 21
3z = 2 + 21

Combine like terms: 2 + 21 = 23
3z = 23

Divide each side by '3'.
z = 7.666666667

Simplifying
z = 7.666666667

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