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4.2=3y-5.4
We move all terms to the left:
4.2-(3y-5.4)=0
We get rid of parentheses
-3y+5.4+4.2=0
We add all the numbers together, and all the variables
-3y+9.6=0
We move all terms containing y to the left, all other terms to the right
-3y=-9.6
y=-9.6/-3
y=3+0.6/3
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