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k*2-30=15
We simplify the equation to the form, which is simple to understand
k*2-30=15
We move all terms containing k to the left and all other terms to the right.
+2k=+15+30
We simplify left and right side of the equation.
+2k=+45
We divide both sides of the equation by 2 to get k.
k=22.5
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