3z-(-3)=-21

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Solution for 3z-(-3)=-21 equation: 


Simplifying
3z + -1(-3) = -21

Multiply -1 * -3
3z + 3 = -21

Reorder the terms:
3 + 3z = -21

Solving
3 + 3z = -21

Solving for variable 'z'.

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

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

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

Combine like terms: -21 + -3 = -24
3z = -24

Divide each side by '3'.
z = -8

Simplifying
z = -8

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