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130=k*2
We move all terms to the left:
130-(k*2)=0
We add all the numbers together, and all the variables
-(+k*2)+130=0
We get rid of parentheses
-k*2+130=0
Wy multiply elements
-2k+130=0
We move all terms containing k to the left, all other terms to the right
-2k=-130
k=-130/-2
k=+65
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