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1+4k-1=12
We simplify the equation to the form, which is simple to understand
1+4k-1=12
We move all terms containing k to the left and all other terms to the right.
+4k=+12-1+1
We simplify left and right side of the equation.
+4k=+12
We divide both sides of the equation by 4 to get k.
k=3
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