15z-15=90

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Solution for 15z-15=90 equation: 


Simplifying
15z + -15 = 90

Reorder the terms:
-15 + 15z = 90

Solving
-15 + 15z = 90

Solving for variable 'z'.

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

Add '15' to each side of the equation.
-15 + 15 + 15z = 90 + 15

Combine like terms: -15 + 15 = 0
0 + 15z = 90 + 15
15z = 90 + 15

Combine like terms: 90 + 15 = 105
15z = 105

Divide each side by '15'.
z = 7

Simplifying
z = 7

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