-21=8+2(z-3)

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Solution for -21=8+2(z-3) equation:


Simplifying
-21 = 8 + 2(z + -3)

Reorder the terms:
-21 = 8 + 2(-3 + z)
-21 = 8 + (-3 * 2 + z * 2)
-21 = 8 + (-6 + 2z)

Combine like terms: 8 + -6 = 2
-21 = 2 + 2z

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

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

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

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

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

Divide each side by '-2'.
z = -11.5

Simplifying
z = -11.5

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