.10(k+20)=100

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Solution for .10(k+20)=100 equation: 


Simplifying
0.10(k + 20) = 100

Reorder the terms:
0.10(20 + k) = 100
(20 * 0.10 + k * 0.10) = 100
(2 + 0.10k) = 100

Solving
2 + 0.10k = 100

Solving for variable 'k'.

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

Add '-2' to each side of the equation.
2 + -2 + 0.10k = 100 + -2

Combine like terms: 2 + -2 = 0
0 + 0.10k = 100 + -2
0.10k = 100 + -2

Combine like terms: 100 + -2 = 98
0.10k = 98

Divide each side by '0.10'.
k = 980

Simplifying
k = 980

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