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103=-7+20-30k
We simplify the equation to the form, which is simple to understand
103=-7+20-30k
We move all terms containing k to the left and all other terms to the right.
+30k=-7+20-103
We simplify left and right side of the equation.
+30k=-90
We divide both sides of the equation by 030 to get k.
k=-3
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