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-12=j/18.
We move all terms to the left:
-12-(j/18.)=0
We add all the numbers together, and all the variables
-(+j/18.)-12=0
We get rid of parentheses
-j/18.-12=0
We multiply all the terms by the denominator
-j-12*18.=0
We add all the numbers together, and all the variables
-1j-216=0
We move all terms containing j to the left, all other terms to the right
-j=216
j=216/-1
j=-216
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