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-48=-3 (4+3k)
We simplify the equation to the form, which is simple to understand
-48=-3(4+3k)
Reorder the terms in parentheses
-48=+(-12-9k)
Remove unnecessary parentheses
-48=-12-9k
We move all terms containing k to the left and all other terms to the right.
+9k=-12+48
We simplify left and right side of the equation.
+9k=+36
We divide both sides of the equation by 09 to get k.
k=4
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