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121=k+(-12)
We simplify the equation to the form, which is simple to understand
121=k+(-12)
Remove unnecessary parentheses
+121=+k-12
We move all terms containing k to the left and all other terms to the right.
-1k=-12-121
We simplify left and right side of the equation.
-1k=-133
We divide both sides of the equation by -01 to get k.
k=133
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