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3(k+1)=15
We simplify the equation to the form, which is simple to understand
3(k+1)=15
Reorder the terms in parentheses
+(+3k+3)=15
Remove unnecessary parentheses
+3k+3=+15
We move all terms containing k to the left and all other terms to the right.
+3k=+15-3
We simplify left and right side of the equation.
+3k=+12
We divide both sides of the equation by 3 to get k.
k=4
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