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Answer :

Spacego

Answer:

z = -9

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

Algebra I

  • Terms/Coefficients/Degrees

Step-by-step explanation:

Step 1: Define

-21 = z - (-6 - 2z)

Step 2: Solve for z

  1. Distribute negative:                      -21 = z + 6 + 2z
  2. Combine like terms:                     -21 = 3z + 6
  3. Isolate z term:                               -27 = 3z
  4. Isolate z:                                        -9 = z
  5. Rewrite:                                         z = -9
Kriteeygo

Answer:

Step-by-step explanation

-21-6=2z+z

Or,-27=3z

Or,z=-9

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