(7+5)k-9=2k+21

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Solution for (7+5)k-9=2k+21 equation:


Simplifying
(7 + 5) * k + -9 = 2k + 21

Combine like terms: 7 + 5 = 12
(12) * k + -9 = 2k + 21

Reorder the terms:
-9 + 12k = 2k + 21

Reorder the terms:
-9 + 12k = 21 + 2k

Solving
-9 + 12k = 21 + 2k

Solving for variable 'k'.

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

Add '-2k' to each side of the equation.
-9 + 12k + -2k = 21 + 2k + -2k

Combine like terms: 12k + -2k = 10k
-9 + 10k = 21 + 2k + -2k

Combine like terms: 2k + -2k = 0
-9 + 10k = 21 + 0
-9 + 10k = 21

Add '9' to each side of the equation.
-9 + 9 + 10k = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 10k = 21 + 9
10k = 21 + 9

Combine like terms: 21 + 9 = 30
10k = 30

Divide each side by '10'.
k = 3

Simplifying
k = 3

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