4(k-1)=21-k

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Solution for 4(k-1)=21-k equation:


Simplifying
4(k + -1) = 21 + -1k

Reorder the terms:
4(-1 + k) = 21 + -1k
(-1 * 4 + k * 4) = 21 + -1k
(-4 + 4k) = 21 + -1k

Solving
-4 + 4k = 21 + -1k

Solving for variable 'k'.

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

Add 'k' to each side of the equation.
-4 + 4k + k = 21 + -1k + k

Combine like terms: 4k + k = 5k
-4 + 5k = 21 + -1k + k

Combine like terms: -1k + k = 0
-4 + 5k = 21 + 0
-4 + 5k = 21

Add '4' to each side of the equation.
-4 + 4 + 5k = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5k = 21 + 4
5k = 21 + 4

Combine like terms: 21 + 4 = 25
5k = 25

Divide each side by '5'.
k = 5

Simplifying
k = 5

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