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-2y+5.4=-2.1+0.5y
We move all terms to the left:
-2y+5.4-(-2.1+0.5y)=0
We add all the numbers together, and all the variables
-2y-(0.5y-2.1)+5.4=0
We get rid of parentheses
-2y-0.5y+2.1+5.4=0
We add all the numbers together, and all the variables
-2.5y+7.5=0
We move all terms containing y to the left, all other terms to the right
-2.5y=-7.5
y=-7.5/-2.5
y=+3
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