-21=2n+5n

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Solution for -21=2n+5n equation:


Simplifying
-21 = 2n + 5n

Combine like terms: 2n + 5n = 7n
-21 = 7n

Solving
-21 = 7n

Solving for variable 'n'.

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

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

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

Add '21' to each side of the equation.
-21 + 21 + -7n = 0 + 21

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

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

Divide each side by '-7'.
n = -3

Simplifying
n = -3

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