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18j-1=19j-20
We move all terms to the left:
18j-1-(19j-20)=0
We get rid of parentheses
18j-19j+20-1=0
We add all the numbers together, and all the variables
-1j+19=0
We move all terms containing j to the left, all other terms to the right
-j=-19
j=-19/-1
j=+19
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