7k-21=4k+9

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Solution for 7k-21=4k+9 equation:


Simplifying
7k + -21 = 4k + 9

Reorder the terms:
-21 + 7k = 4k + 9

Reorder the terms:
-21 + 7k = 9 + 4k

Solving
-21 + 7k = 9 + 4k

Solving for variable 'k'.

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

Add '-4k' to each side of the equation.
-21 + 7k + -4k = 9 + 4k + -4k

Combine like terms: 7k + -4k = 3k
-21 + 3k = 9 + 4k + -4k

Combine like terms: 4k + -4k = 0
-21 + 3k = 9 + 0
-21 + 3k = 9

Add '21' to each side of the equation.
-21 + 21 + 3k = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 3k = 9 + 21
3k = 9 + 21

Combine like terms: 9 + 21 = 30
3k = 30

Divide each side by '3'.
k = 10

Simplifying
k = 10

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