-10=1-(k-9)

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Solution for -10=1-(k-9) equation:


Simplifying
-10 = 1 + -1(k + -9)

Reorder the terms:
-10 = 1 + -1(-9 + k)
-10 = 1 + (-9 * -1 + k * -1)
-10 = 1 + (9 + -1k)

Combine like terms: 1 + 9 = 10
-10 = 10 + -1k

Solving
-10 = 10 + -1k

Solving for variable 'k'.

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

Add 'k' to each side of the equation.
-10 + k = 10 + -1k + k

Combine like terms: -1k + k = 0
-10 + k = 10 + 0
-10 + k = 10

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

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

Combine like terms: 10 + 10 = 20
k = 20

Simplifying
k = 20

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