(3n+19)+(4n+21)=180

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Solution for (3n+19)+(4n+21)=180 equation:


Simplifying
(3n + 19) + (4n + 21) = 180

Reorder the terms:
(19 + 3n) + (4n + 21) = 180

Remove parenthesis around (19 + 3n)
19 + 3n + (4n + 21) = 180

Reorder the terms:
19 + 3n + (21 + 4n) = 180

Remove parenthesis around (21 + 4n)
19 + 3n + 21 + 4n = 180

Reorder the terms:
19 + 21 + 3n + 4n = 180

Combine like terms: 19 + 21 = 40
40 + 3n + 4n = 180

Combine like terms: 3n + 4n = 7n
40 + 7n = 180

Solving
40 + 7n = 180

Solving for variable 'n'.

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

Add '-40' to each side of the equation.
40 + -40 + 7n = 180 + -40

Combine like terms: 40 + -40 = 0
0 + 7n = 180 + -40
7n = 180 + -40

Combine like terms: 180 + -40 = 140
7n = 140

Divide each side by '7'.
n = 20

Simplifying
n = 20

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