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13k+3k-13k-3k+2k=20
We simplify the equation to the form, which is simple to understand
13k+3k-13k-3k+2k=20
We move all terms containing k to the left and all other terms to the right.
+13k+3k-13k-3k+2k=+20
We simplify left and right side of the equation.
+2k=+20
We divide both sides of the equation by 2 to get k.
k=10
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