21=1+7k-8

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Solution for 21=1+7k-8 equation:


Simplifying
21 = 1 + 7k + -8

Reorder the terms:
21 = 1 + -8 + 7k

Combine like terms: 1 + -8 = -7
21 = -7 + 7k

Solving
21 = -7 + 7k

Solving for variable 'k'.

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

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

Combine like terms: 7k + -7k = 0
21 + -7k = -7 + 0
21 + -7k = -7

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

Combine like terms: 21 + -21 = 0
0 + -7k = -7 + -21
-7k = -7 + -21

Combine like terms: -7 + -21 = -28
-7k = -28

Divide each side by '-7'.
k = 4

Simplifying
k = 4

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