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419=-9(10k+3)-4
We simplify the equation to the form, which is simple to understand
419=-9(10k+3)-4
Reorder the terms in parentheses
419=+(-90k-27)-4
Remove unnecessary parentheses
+419=-90k-27-4
We move all terms containing k to the left and all other terms to the right.
+90k=-27-4-419
We simplify left and right side of the equation.
+90k=-450
We divide both sides of the equation by 090 to get k.
k=-5
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