12+13+5+n=72

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Solution for 12+13+5+n=72 equation: 


Simplifying
12 + 13 + 5 + n = 72

Combine like terms: 12 + 13 = 25
25 + 5 + n = 72

Combine like terms: 25 + 5 = 30
30 + n = 72

Solving
30 + n = 72

Solving for variable 'n'.

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

Add '-30' to each side of the equation.
30 + -30 + n = 72 + -30

Combine like terms: 30 + -30 = 0
0 + n = 72 + -30
n = 72 + -30

Combine like terms: 72 + -30 = 42
n = 42

Simplifying
n = 42

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