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-4=2(2-9k)-k
We simplify the equation to the form, which is simple to understand
-4=2(2-9k)-k
Reorder the terms in parentheses
-4=+(+4-18k)-k
Remove unnecessary parentheses
-4=+4-18k-k
We move all terms containing k to the left and all other terms to the right.
+18k+1k=+4+4
We simplify left and right side of the equation.
+19k=+8
We divide both sides of the equation by 19 to get k.
k=0.421052631579
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