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129=10k+19
We move all terms to the left:
129-(10k+19)=0
We get rid of parentheses
-10k-19+129=0
We add all the numbers together, and all the variables
-10k+110=0
We move all terms containing k to the left, all other terms to the right
-10k=-110
k=-110/-10
k=+11
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