10[1+3l]=-20

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Solution for 10[1+3l]=-20 equation: 


Simplifying
10[1 + 3l] = -20
[1 * 10 + 3l * 10] = -20
[10 + 30l] = -20

Solving
10 + 30l = -20

Solving for variable 'l'.

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

Add '-10' to each side of the equation.
10 + -10 + 30l = -20 + -10

Combine like terms: 10 + -10 = 0
0 + 30l = -20 + -10
30l = -20 + -10

Combine like terms: -20 + -10 = -30
30l = -30

Divide each side by '30'.
l = -1

Simplifying
l = -1

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