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15-3*k=7
We simplify the equation to the form, which is simple to understand
15-3*k=7
We move all terms containing k to the left and all other terms to the right.
-3k=+7-15
We simplify left and right side of the equation.
-3k=-8
We divide both sides of the equation by -3 to get k.
k=2.6666666666667
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