21=7l

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Solution for 21=7l equation:


Simplifying
21 = 7l

Solving
21 = 7l

Solving for variable 'l'.

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

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

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

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

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

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

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

Simplifying
l = 3

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