-28=-7(3x+4)+21k

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Solution for -28=-7(3x+4)+21k equation: 


Simplifying
-28 = -7(3x + 4) + 21k

Reorder the terms:
-28 = -7(4 + 3x) + 21k
-28 = (4 * -7 + 3x * -7) + 21k
-28 = (-28 + -21x) + 21k

Reorder the terms:
-28 = -28 + 21k + -21x

Add '28' to each side of the equation.
-28 + 28 = -28 + 21k + 28 + -21x

Combine like terms: -28 + 28 = 0
0 = -28 + 21k + 28 + -21x

Reorder the terms:
0 = -28 + 28 + 21k + -21x

Combine like terms: -28 + 28 = 0
0 = 0 + 21k + -21x
0 = 21k + -21x

Solving
0 = 21k + -21x

Solving for variable 'k'.

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

Add '-21k' to each side of the equation.
0 + -21k = 21k + -21k + -21x
Remove the zero:
-21k = 21k + -21k + -21x

Combine like terms: 21k + -21k = 0
-21k = 0 + -21x
-21k = -21x

Divide each side by '-21'.
k = x

Simplifying
k = x

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