30+12(n-1)=120

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Solution for 30+12(n-1)=120 equation: 


Simplifying
30 + 12(n + -1) = 120

Reorder the terms:
30 + 12(-1 + n) = 120
30 + (-1 * 12 + n * 12) = 120
30 + (-12 + 12n) = 120

Combine like terms: 30 + -12 = 18
18 + 12n = 120

Solving
18 + 12n = 120

Solving for variable 'n'.

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

Add '-18' to each side of the equation.
18 + -18 + 12n = 120 + -18

Combine like terms: 18 + -18 = 0
0 + 12n = 120 + -18
12n = 120 + -18

Combine like terms: 120 + -18 = 102
12n = 102

Divide each side by '12'.
n = 8.5

Simplifying
n = 8.5

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