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5k+5+3k+5=90
We simplify the equation to the form, which is simple to understand
5k+5+3k+5=90
We move all terms containing k to the left and all other terms to the right.
+5k+3k=+90-5-5
We simplify left and right side of the equation.
+8k=+80
We divide both sides of the equation by 8 to get k.
k=10
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