15-2+8z=85

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Solution for 15-2+8z=85 equation: 


Simplifying
15 + -2 + 8z = 85

Combine like terms: 15 + -2 = 13
13 + 8z = 85

Solving
13 + 8z = 85

Solving for variable 'z'.

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

Add '-13' to each side of the equation.
13 + -13 + 8z = 85 + -13

Combine like terms: 13 + -13 = 0
0 + 8z = 85 + -13
8z = 85 + -13

Combine like terms: 85 + -13 = 72
8z = 72

Divide each side by '8'.
z = 9

Simplifying
z = 9

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