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0.40(j+40)=-4
We move all terms to the left:
0.40(j+40)-(-4)=0
We add all the numbers together, and all the variables
0.40(j+40)+4=0
We multiply parentheses
0.4j+16+4=0
We add all the numbers together, and all the variables
0.4j+20=0
We move all terms containing j to the left, all other terms to the right
0.4j=-20
j=-20/0.4
j=-50
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