21=5n-2-7

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Solution for 21=5n-2-7 equation:


Simplifying
21 = 5n + -2 + -7

Reorder the terms:
21 = -2 + -7 + 5n

Combine like terms: -2 + -7 = -9
21 = -9 + 5n

Solving
21 = -9 + 5n

Solving for variable 'n'.

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

Add '-5n' to each side of the equation.
21 + -5n = -9 + 5n + -5n

Combine like terms: 5n + -5n = 0
21 + -5n = -9 + 0
21 + -5n = -9

Add '-21' to each side of the equation.
21 + -21 + -5n = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -5n = -9 + -21
-5n = -9 + -21

Combine like terms: -9 + -21 = -30
-5n = -30

Divide each side by '-5'.
n = 6

Simplifying
n = 6

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