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2.5-k=3.5
We simplify the equation to the form, which is simple to understand
2.5-k=3.5
We move all terms containing k to the left and all other terms to the right.
-1k=+3.5-2.5
We simplify left and right side of the equation.
-1k=+1
We divide both sides of the equation by -1 to get k.
k=-1
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