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-1.3y+y+26.666=21
We move all terms to the left:
-1.3y+y+26.666-(21)=0
We add all the numbers together, and all the variables
-0.3y+5.666=0
We move all terms containing y to the left, all other terms to the right
-0.3y=-5.666
y=-5.666/-0.3
y=18+0.266/0.3
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