(21-z)+(48-z)=168

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Solution for (21-z)+(48-z)=168 equation:


Simplifying
(21 + -1z) + (48 + -1z) = 168

Remove parenthesis around (21 + -1z)
21 + -1z + (48 + -1z) = 168

Remove parenthesis around (48 + -1z)
21 + -1z + 48 + -1z = 168

Reorder the terms:
21 + 48 + -1z + -1z = 168

Combine like terms: 21 + 48 = 69
69 + -1z + -1z = 168

Combine like terms: -1z + -1z = -2z
69 + -2z = 168

Solving
69 + -2z = 168

Solving for variable 'z'.

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

Add '-69' to each side of the equation.
69 + -69 + -2z = 168 + -69

Combine like terms: 69 + -69 = 0
0 + -2z = 168 + -69
-2z = 168 + -69

Combine like terms: 168 + -69 = 99
-2z = 99

Divide each side by '-2'.
z = -49.5

Simplifying
z = -49.5

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