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11j-9j+2j-7j=(-9)
We move all terms to the left:
11j-9j+2j-7j-((-9))=0
We add all the numbers together, and all the variables
-3j+9=0
We move all terms containing j to the left, all other terms to the right
-3j=-9
j=-9/-3
j=+3
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