21=6l+5-7l

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Solution for 21=6l+5-7l equation:


Simplifying
21 = 6l + 5 + -7l

Reorder the terms:
21 = 5 + 6l + -7l

Combine like terms: 6l + -7l = -1l
21 = 5 + -1l

Solving
21 = 5 + -1l

Solving for variable 'l'.

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

Add 'l' to each side of the equation.
21 + l = 5 + -1l + l

Combine like terms: -1l + l = 0
21 + l = 5 + 0
21 + l = 5

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

Combine like terms: 21 + -21 = 0
0 + l = 5 + -21
l = 5 + -21

Combine like terms: 5 + -21 = -16
l = -16

Simplifying
l = -16

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