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k+4k+3k=180
We simplify the equation to the form, which is simple to understand
k+4k+3k=180
We move all terms containing k to the left and all other terms to the right.
+1k+4k+3k=+180
We simplify left and right side of the equation.
+8k=+180
We divide both sides of the equation by 8 to get k.
k=22.5
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