7(k+3)=42(12-k)

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Solution for 7(k+3)=42(12-k) equation:


Simplifying
7(k + 3) = 42(12 + -1k)

Reorder the terms:
7(3 + k) = 42(12 + -1k)
(3 * 7 + k * 7) = 42(12 + -1k)
(21 + 7k) = 42(12 + -1k)
21 + 7k = (12 * 42 + -1k * 42)
21 + 7k = (504 + -42k)

Solving
21 + 7k = 504 + -42k

Solving for variable 'k'.

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

Add '42k' to each side of the equation.
21 + 7k + 42k = 504 + -42k + 42k

Combine like terms: 7k + 42k = 49k
21 + 49k = 504 + -42k + 42k

Combine like terms: -42k + 42k = 0
21 + 49k = 504 + 0
21 + 49k = 504

Add '-21' to each side of the equation.
21 + -21 + 49k = 504 + -21

Combine like terms: 21 + -21 = 0
0 + 49k = 504 + -21
49k = 504 + -21

Combine like terms: 504 + -21 = 483
49k = 483

Divide each side by '49'.
k = 9.857142857

Simplifying
k = 9.857142857

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