(3z-1)+(z+7)=90

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Solution for (3z-1)+(z+7)=90 equation:


Simplifying
(3z + -1) + (z + 7) = 90

Reorder the terms:
(-1 + 3z) + (z + 7) = 90

Remove parenthesis around (-1 + 3z)
-1 + 3z + (z + 7) = 90

Reorder the terms:
-1 + 3z + (7 + z) = 90

Remove parenthesis around (7 + z)
-1 + 3z + 7 + z = 90

Reorder the terms:
-1 + 7 + 3z + z = 90

Combine like terms: -1 + 7 = 6
6 + 3z + z = 90

Combine like terms: 3z + z = 4z
6 + 4z = 90

Solving
6 + 4z = 90

Solving for variable 'z'.

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

Add '-6' to each side of the equation.
6 + -6 + 4z = 90 + -6

Combine like terms: 6 + -6 = 0
0 + 4z = 90 + -6
4z = 90 + -6

Combine like terms: 90 + -6 = 84
4z = 84

Divide each side by '4'.
z = 21

Simplifying
z = 21

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