3(21-k)-k=21

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Solution for 3(21-k)-k=21 equation:


Simplifying
3(21 + -1k) + -1k = 21
(21 * 3 + -1k * 3) + -1k = 21
(63 + -3k) + -1k = 21

Combine like terms: -3k + -1k = -4k
63 + -4k = 21

Solving
63 + -4k = 21

Solving for variable 'k'.

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

Add '-63' to each side of the equation.
63 + -63 + -4k = 21 + -63

Combine like terms: 63 + -63 = 0
0 + -4k = 21 + -63
-4k = 21 + -63

Combine like terms: 21 + -63 = -42
-4k = -42

Divide each side by '-4'.
k = 10.5

Simplifying
k = 10.5

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