7(9+3k)=-21+9k

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Solution for 7(9+3k)=-21+9k equation:


Simplifying
7(9 + 3k) = -21 + 9k
(9 * 7 + 3k * 7) = -21 + 9k
(63 + 21k) = -21 + 9k

Solving
63 + 21k = -21 + 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.
63 + 21k + -9k = -21 + 9k + -9k

Combine like terms: 21k + -9k = 12k
63 + 12k = -21 + 9k + -9k

Combine like terms: 9k + -9k = 0
63 + 12k = -21 + 0
63 + 12k = -21

Add '-63' to each side of the equation.
63 + -63 + 12k = -21 + -63

Combine like terms: 63 + -63 = 0
0 + 12k = -21 + -63
12k = -21 + -63

Combine like terms: -21 + -63 = -84
12k = -84

Divide each side by '12'.
k = -7

Simplifying
k = -7

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