30-12=n+15

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Solution for 30-12=n+15 equation:


Simplifying
30 + -12 = n + 15

Combine like terms: 30 + -12 = 18
18 = n + 15

Reorder the terms:
18 = 15 + n

Solving
18 = 15 + n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
18 + -1n = 15 + n + -1n

Combine like terms: n + -1n = 0
18 + -1n = 15 + 0
18 + -1n = 15

Add '-18' to each side of the equation.
18 + -18 + -1n = 15 + -18

Combine like terms: 18 + -18 = 0
0 + -1n = 15 + -18
-1n = 15 + -18

Combine like terms: 15 + -18 = -3
-1n = -3

Divide each side by '-1'.
n = 3

Simplifying
n = 3

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