3n+21+4n+12=180

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Solution for 3n+21+4n+12=180 equation: 


Simplifying
3n + 21 + 4n + 12 = 180

Reorder the terms:
21 + 12 + 3n + 4n = 180

Combine like terms: 21 + 12 = 33
33 + 3n + 4n = 180

Combine like terms: 3n + 4n = 7n
33 + 7n = 180

Solving
33 + 7n = 180

Solving for variable 'n'.

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

Add '-33' to each side of the equation.
33 + -33 + 7n = 180 + -33

Combine like terms: 33 + -33 = 0
0 + 7n = 180 + -33
7n = 180 + -33

Combine like terms: 180 + -33 = 147
7n = 147

Divide each side by '7'.
n = 21

Simplifying
n = 21

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