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19.9+3y=6y+13
We move all terms to the left:
19.9+3y-(6y+13)=0
We get rid of parentheses
3y-6y-13+19.9=0
We add all the numbers together, and all the variables
-3y+6.9=0
We move all terms containing y to the left, all other terms to the right
-3y=-6.9
y=-6.9/-3
y=2+0.9/3
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