7k-21=3k-21

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Solution for 7k-21=3k-21 equation:


Simplifying
7k + -21 = 3k + -21

Reorder the terms:
-21 + 7k = 3k + -21

Reorder the terms:
-21 + 7k = -21 + 3k

Add '21' to each side of the equation.
-21 + 21 + 7k = -21 + 21 + 3k

Combine like terms: -21 + 21 = 0
0 + 7k = -21 + 21 + 3k
7k = -21 + 21 + 3k

Combine like terms: -21 + 21 = 0
7k = 0 + 3k
7k = 3k

Solving
7k = 3k

Solving for variable 'k'.

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

Add '-3k' to each side of the equation.
7k + -3k = 3k + -3k

Combine like terms: 7k + -3k = 4k
4k = 3k + -3k

Combine like terms: 3k + -3k = 0
4k = 0

Divide each side by '4'.
k = 0

Simplifying
k = 0

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