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1000(679041-0.8y)+800y=679041
We move all terms to the left:
1000(679041-0.8y)+800y-(679041)=0
We add all the numbers together, and all the variables
1000(-0.8y+679041)+800y-679041=0
We add all the numbers together, and all the variables
800y+1000(-0.8y+679041)-679041=0
We multiply parentheses
800y+0y+679041000-679041=0
We add all the numbers together, and all the variables
801y+678361959=0
We move all terms containing y to the left, all other terms to the right
801y=-678361959
y=-678361959/801
y=-846893+74/89
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