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55=7+3k-12
We simplify the equation to the form, which is simple to understand
55=7+3k-12
We move all terms containing k to the left and all other terms to the right.
-3k=+7-12-55
We simplify left and right side of the equation.
-3k=-60
We divide both sides of the equation by -03 to get k.
k=20
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