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27k-90=21k+12
We simplify the equation to the form, which is simple to understand
27k-90=21k+12
We move all terms containing k to the left and all other terms to the right.
+27k-21k=+12+90
We simplify left and right side of the equation.
+6k=+102
We divide both sides of the equation by 6 to get k.
k=17
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