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7k-35-21+7k=4k-12
We simplify the equation to the form, which is simple to understand
7k-35-21+7k=4k-12
We move all terms containing k to the left and all other terms to the right.
+7k+7k-4k=-12+35+21
We simplify left and right side of the equation.
+10k=+44
We divide both sides of the equation by 10 to get k.
k=4.4
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