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-4j=-9(j+7)
We move all terms to the left:
-4j-(-9(j+7))=0
We calculate terms in parentheses: -(-9(j+7)), so:We get rid of parentheses
-9(j+7)
We multiply parentheses
-9j-63
Back to the equation:
-(-9j-63)
-4j+9j+63=0
We add all the numbers together, and all the variables
5j+63=0
We move all terms containing j to the left, all other terms to the right
5j=-63
j=-63/5
j=-12+3/5
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