3+7l+2l=21

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Solution for 3+7l+2l=21 equation: 


Simplifying
3 + 7l + 2l = 21

Combine like terms: 7l + 2l = 9l
3 + 9l = 21

Solving
3 + 9l = 21

Solving for variable 'l'.

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

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

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

Combine like terms: 21 + -3 = 18
9l = 18

Divide each side by '9'.
l = 2

Simplifying
l = 2

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