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4+12=3+4+K+8
We move all terms to the left:
4+12-(3+4+K+8)=0
We add all the numbers together, and all the variables
-(K+15)+4+12=0
We add all the numbers together, and all the variables
-(K+15)+16=0
We get rid of parentheses
-K-15+16=0
We add all the numbers together, and all the variables
-1K+1=0
We move all terms containing K to the left, all other terms to the right
-K=-1
K=-1/-1
K=1
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