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-3.1+2.1=0.7y-5.5
We move all terms to the left:
-3.1+2.1-(0.7y-5.5)=0
We add all the numbers together, and all the variables
-(0.7y-5.5)-1=0
We get rid of parentheses
-0.7y+5.5-1=0
We add all the numbers together, and all the variables
-0.7y+4.5=0
We move all terms containing y to the left, all other terms to the right
-0.7y=-4.5
y=-4.5/-0.7
y=6+0.3/0.7
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