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75=3j+18

We move all terms to the left:

75-(3j+18)=0

We get rid of parentheses

-3j-18+75=0

We add all the numbers together, and all the variables

-3j+57=0

We move all terms containing j to the left, all other terms to the right

-3j=-57

j=-57/-3

j=+19

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