2k-7(-3-k)=57

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Solution for 2k-7(-3-k)=57 equation:


Simplifying
2k + -7(-3 + -1k) = 57
2k + (-3 * -7 + -1k * -7) = 57
2k + (21 + 7k) = 57

Reorder the terms:
21 + 2k + 7k = 57

Combine like terms: 2k + 7k = 9k
21 + 9k = 57

Solving
21 + 9k = 57

Solving for variable 'k'.

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

Add '-21' to each side of the equation.
21 + -21 + 9k = 57 + -21

Combine like terms: 21 + -21 = 0
0 + 9k = 57 + -21
9k = 57 + -21

Combine like terms: 57 + -21 = 36
9k = 36

Divide each side by '9'.
k = 4

Simplifying
k = 4

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