20=-11-(13k)-(18k)

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Solution for 20=-11-(13k)-(18k) equation: 


Simplifying
20 = -11 + -1(13k) + -1(18k)

Remove parenthesis around (13k)
20 = -11 + -1 * 13k + -1(18k)

Multiply -1 * 13
20 = -11 + -13k + -1(18k)

Remove parenthesis around (18k)
20 = -11 + -13k + -1 * 18k

Multiply -1 * 18
20 = -11 + -13k + -18k

Combine like terms: -13k + -18k = -31k
20 = -11 + -31k

Solving
20 = -11 + -31k

Solving for variable 'k'.

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

Add '31k' to each side of the equation.
20 + 31k = -11 + -31k + 31k

Combine like terms: -31k + 31k = 0
20 + 31k = -11 + 0
20 + 31k = -11

Add '-20' to each side of the equation.
20 + -20 + 31k = -11 + -20

Combine like terms: 20 + -20 = 0
0 + 31k = -11 + -20
31k = -11 + -20

Combine like terms: -11 + -20 = -31
31k = -31

Divide each side by '31'.
k = -1

Simplifying
k = -1

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