(n+7)=3n+21

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Solution for (n+7)=3n+21 equation:


Simplifying
(n + 7) = 3n + 21

Reorder the terms:
(7 + n) = 3n + 21

Remove parenthesis around (7 + n)
7 + n = 3n + 21

Reorder the terms:
7 + n = 21 + 3n

Solving
7 + n = 21 + 3n

Solving for variable 'n'.

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

Add '-3n' to each side of the equation.
7 + n + -3n = 21 + 3n + -3n

Combine like terms: n + -3n = -2n
7 + -2n = 21 + 3n + -3n

Combine like terms: 3n + -3n = 0
7 + -2n = 21 + 0
7 + -2n = 21

Add '-7' to each side of the equation.
7 + -7 + -2n = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -2n = 21 + -7
-2n = 21 + -7

Combine like terms: 21 + -7 = 14
-2n = 14

Divide each side by '-2'.
n = -7

Simplifying
n = -7

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