20=7*k-(k-4)*(-1)

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Solution for 20=7*k-(k-4)*(-1) equation:


Simplifying
20 = 7k + -1(k + -4)(-1)

Reorder the terms:
20 = 7k + -1(-4 + k)(-1)

Reorder the terms for easier multiplication:
20 = 7k + -1 * -1(-4 + k)

Multiply -1 * -1
20 = 7k + 1(-4 + k)
20 = 7k + (-4 * 1 + k * 1)
20 = 7k + (-4 + 1k)

Reorder the terms:
20 = -4 + 7k + 1k

Combine like terms: 7k + 1k = 8k
20 = -4 + 8k

Solving
20 = -4 + 8k

Solving for variable 'k'.

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

Add '-8k' to each side of the equation.
20 + -8k = -4 + 8k + -8k

Combine like terms: 8k + -8k = 0
20 + -8k = -4 + 0
20 + -8k = -4

Add '-20' to each side of the equation.
20 + -20 + -8k = -4 + -20

Combine like terms: 20 + -20 = 0
0 + -8k = -4 + -20
-8k = -4 + -20

Combine like terms: -4 + -20 = -24
-8k = -24

Divide each side by '-8'.
k = 3

Simplifying
k = 3

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