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10(k+1)+20=100
We simplify the equation to the form, which is simple to understand
10(k+1)+20=100
Reorder the terms in parentheses
+(+10k+10)+20=100
Remove unnecessary parentheses
+10k+10+20=+100
We move all terms containing k to the left and all other terms to the right.
+10k=+100-10-20
We simplify left and right side of the equation.
+10k=+70
We divide both sides of the equation by 10 to get k.
k=7
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