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8(25-j)=80
We move all terms to the left:
8(25-j)-(80)=0
We add all the numbers together, and all the variables
8(-1j+25)-80=0
We multiply parentheses
-8j+200-80=0
We add all the numbers together, and all the variables
-8j+120=0
We move all terms containing j to the left, all other terms to the right
-8j=-120
j=-120/-8
j=+15
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