12-(k+3)=10

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Solution for 12-(k+3)=10 equation: 


Simplifying
12 + -1(k + 3) = 10

Reorder the terms:
12 + -1(3 + k) = 10
12 + (3 * -1 + k * -1) = 10
12 + (-3 + -1k) = 10

Combine like terms: 12 + -3 = 9
9 + -1k = 10

Solving
9 + -1k = 10

Solving for variable 'k'.

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

Add '-9' to each side of the equation.
9 + -9 + -1k = 10 + -9

Combine like terms: 9 + -9 = 0
0 + -1k = 10 + -9
-1k = 10 + -9

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

Divide each side by '-1'.
k = -1

Simplifying
k = -1

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