21=4n-7

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Solution for 21=4n-7 equation:


Simplifying
21 = 4n + -7

Reorder the terms:
21 = -7 + 4n

Solving
21 = -7 + 4n

Solving for variable 'n'.

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

Add '-4n' to each side of the equation.
21 + -4n = -7 + 4n + -4n

Combine like terms: 4n + -4n = 0
21 + -4n = -7 + 0
21 + -4n = -7

Add '-21' to each side of the equation.
21 + -21 + -4n = -7 + -21

Combine like terms: 21 + -21 = 0
0 + -4n = -7 + -21
-4n = -7 + -21

Combine like terms: -7 + -21 = -28
-4n = -28

Divide each side by '-4'.
n = 7

Simplifying
n = 7

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