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k+2k+90+90=360
We simplify the equation to the form, which is simple to understand
k+2k+90+90=360
We move all terms containing k to the left and all other terms to the right.
+1k+2k=+360-90-90
We simplify left and right side of the equation.
+3k=+180
We divide both sides of the equation by 3 to get k.
k=60
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