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15j-7j-(-4j)-(-5j)-16j=20

We move all terms to the left:

15j-7j-(-4j)-(-5j)-16j-(20)=0

We add all the numbers together, and all the variables

-8j-(-4j)-(-5j)-20=0

We get rid of parentheses

-8j+4j+5j-20=0

We add all the numbers together, and all the variables

j-20=0

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

j=20

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