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975=k*13*15
We move all terms to the left:
975-(k*13*15)=0
We add all the numbers together, and all the variables
-(+k*13*15)+975=0
We get rid of parentheses
-k*13*15+975=0
Wy multiply elements
-195k*1+975=0
Wy multiply elements
-195k+975=0
We move all terms containing k to the left, all other terms to the right
-195k=-975
k=-975/-195
k=+5
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