4(z+5)-15=21

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Solution for 4(z+5)-15=21 equation:


Simplifying
4(z + 5) + -15 = 21

Reorder the terms:
4(5 + z) + -15 = 21
(5 * 4 + z * 4) + -15 = 21
(20 + 4z) + -15 = 21

Reorder the terms:
20 + -15 + 4z = 21

Combine like terms: 20 + -15 = 5
5 + 4z = 21

Solving
5 + 4z = 21

Solving for variable 'z'.

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

Add '-5' to each side of the equation.
5 + -5 + 4z = 21 + -5

Combine like terms: 5 + -5 = 0
0 + 4z = 21 + -5
4z = 21 + -5

Combine like terms: 21 + -5 = 16
4z = 16

Divide each side by '4'.
z = 4

Simplifying
z = 4

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