7(k-7)-(-3k-9)=9k

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Solution for 7(k-7)-(-3k-9)=9k equation:


Simplifying
7(k + -7) + -1(-3k + -9) = 9k

Reorder the terms:
7(-7 + k) + -1(-3k + -9) = 9k
(-7 * 7 + k * 7) + -1(-3k + -9) = 9k
(-49 + 7k) + -1(-3k + -9) = 9k

Reorder the terms:
-49 + 7k + -1(-9 + -3k) = 9k
-49 + 7k + (-9 * -1 + -3k * -1) = 9k
-49 + 7k + (9 + 3k) = 9k

Reorder the terms:
-49 + 9 + 7k + 3k = 9k

Combine like terms: -49 + 9 = -40
-40 + 7k + 3k = 9k

Combine like terms: 7k + 3k = 10k
-40 + 10k = 9k

Solving
-40 + 10k = 9k

Solving for variable 'k'.

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

Add '-9k' to each side of the equation.
-40 + 10k + -9k = 9k + -9k

Combine like terms: 10k + -9k = 1k
-40 + 1k = 9k + -9k

Combine like terms: 9k + -9k = 0
-40 + 1k = 0

Add '40' to each side of the equation.
-40 + 40 + 1k = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 1k = 0 + 40
1k = 0 + 40

Combine like terms: 0 + 40 = 40
1k = 40

Divide each side by '1'.
k = 40

Simplifying
k = 40

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