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4k-9=-9k+4
We simplify the equation to the form, which is simple to understand
4k-9=-9k+4
We move all terms containing k to the left and all other terms to the right.
+4k+9k=+4+9
We simplify left and right side of the equation.
+13k=+13
We divide both sides of the equation by 13 to get k.
k=1
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