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80=j/8+71
We move all terms to the left:
80-(j/8+71)=0
We get rid of parentheses
-j/8-71+80=0
We multiply all the terms by the denominator
-j-71*8+80*8=0
We add all the numbers together, and all the variables
-1j+72=0
We move all terms containing j to the left, all other terms to the right
-j=-72
j=-72/-1
j=+72
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