9=3l-21

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Solution for 9=3l-21 equation:


Simplifying
9 = 3l + -21

Reorder the terms:
9 = -21 + 3l

Solving
9 = -21 + 3l

Solving for variable 'l'.

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

Add '-3l' to each side of the equation.
9 + -3l = -21 + 3l + -3l

Combine like terms: 3l + -3l = 0
9 + -3l = -21 + 0
9 + -3l = -21

Add '-9' to each side of the equation.
9 + -9 + -3l = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -3l = -21 + -9
-3l = -21 + -9

Combine like terms: -21 + -9 = -30
-3l = -30

Divide each side by '-3'.
l = 10

Simplifying
l = 10

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