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100-j=j+40
We move all terms to the left:
100-j-(j+40)=0
We add all the numbers together, and all the variables
-1j-(j+40)+100=0
We get rid of parentheses
-1j-j-40+100=0
We add all the numbers together, and all the variables
-2j+60=0
We move all terms containing j to the left, all other terms to the right
-2j=-60
j=-60/-2
j=+30
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