21=2(4z-5)

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Solution for 21=2(4z-5) equation:


Simplifying
21 = 2(4z + -5)

Reorder the terms:
21 = 2(-5 + 4z)
21 = (-5 * 2 + 4z * 2)
21 = (-10 + 8z)

Solving
21 = -10 + 8z

Solving for variable 'z'.

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

Add '-8z' to each side of the equation.
21 + -8z = -10 + 8z + -8z

Combine like terms: 8z + -8z = 0
21 + -8z = -10 + 0
21 + -8z = -10

Add '-21' to each side of the equation.
21 + -21 + -8z = -10 + -21

Combine like terms: 21 + -21 = 0
0 + -8z = -10 + -21
-8z = -10 + -21

Combine like terms: -10 + -21 = -31
-8z = -31

Divide each side by '-8'.
z = 3.875

Simplifying
z = 3.875

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