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12=j/2+7
We move all terms to the left:
12-(j/2+7)=0
We get rid of parentheses
-j/2-7+12=0
We multiply all the terms by the denominator
-j-7*2+12*2=0
We add all the numbers together, and all the variables
-1j+10=0
We move all terms containing j to the left, all other terms to the right
-j=-10
j=-10/-1
j=+10
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