7=3l-21

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Solution for 7=3l-21 equation:


Simplifying
7 = 3l + -21

Reorder the terms:
7 = -21 + 3l

Solving
7 = -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.
7 + -3l = -21 + 3l + -3l

Combine like terms: 3l + -3l = 0
7 + -3l = -21 + 0
7 + -3l = -21

Add '-7' to each side of the equation.
7 + -7 + -3l = -21 + -7

Combine like terms: 7 + -7 = 0
0 + -3l = -21 + -7
-3l = -21 + -7

Combine like terms: -21 + -7 = -28
-3l = -28

Divide each side by '-3'.
l = 9.333333333

Simplifying
l = 9.333333333

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