3(7+x)=3x+k

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Solution for 3(7+x)=3x+k equation:


Simplifying
3(7 + x) = 3x + k
(7 * 3 + x * 3) = 3x + k
(21 + 3x) = 3x + k

Reorder the terms:
21 + 3x = k + 3x

Add '-3x' to each side of the equation.
21 + 3x + -3x = k + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + 0 = k + 3x + -3x
21 = k + 3x + -3x

Combine like terms: 3x + -3x = 0
21 = k + 0
21 = k

Solving
21 = k

Solving for variable 'k'.

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

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

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

Add '-21' to each side of the equation.
21 + -21 + -1k = 0 + -21

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

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

Divide each side by '-1'.
k = 21

Simplifying
k = 21

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