k+20-4k=-90

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Solution for k+20-4k=-90 equation:


Simplifying
k + 20 + -4k = -90

Reorder the terms:
20 + k + -4k = -90

Combine like terms: k + -4k = -3k
20 + -3k = -90

Solving
20 + -3k = -90

Solving for variable 'k'.

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

Add '-20' to each side of the equation.
20 + -20 + -3k = -90 + -20

Combine like terms: 20 + -20 = 0
0 + -3k = -90 + -20
-3k = -90 + -20

Combine like terms: -90 + -20 = -110
-3k = -110

Divide each side by '-3'.
k = 36.66666667

Simplifying
k = 36.66666667

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