158=-3(1+7k)-7

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Solution for 158=-3(1+7k)-7 equation:


Simplifying
158 = -3(1 + 7k) + -7
158 = (1 * -3 + 7k * -3) + -7
158 = (-3 + -21k) + -7

Reorder the terms:
158 = -3 + -7 + -21k

Combine like terms: -3 + -7 = -10
158 = -10 + -21k

Solving
158 = -10 + -21k

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.
158 + 21k = -10 + -21k + 21k

Combine like terms: -21k + 21k = 0
158 + 21k = -10 + 0
158 + 21k = -10

Add '-158' to each side of the equation.
158 + -158 + 21k = -10 + -158

Combine like terms: 158 + -158 = 0
0 + 21k = -10 + -158
21k = -10 + -158

Combine like terms: -10 + -158 = -168
21k = -168

Divide each side by '21'.
k = -8

Simplifying
k = -8

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