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21=j-804/6
We move all terms to the left:
21-(j-804/6)=0
We add all the numbers together, and all the variables
-(j-134)+21=0
We get rid of parentheses
-j+134+21=0
We add all the numbers together, and all the variables
-1j+155=0
We move all terms containing j to the left, all other terms to the right
-j=-155
j=-155/-1
j=+155
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