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2.9=y-3.5
We move all terms to the left:
2.9-(y-3.5)=0
We get rid of parentheses
-y+3.5+2.9=0
We add all the numbers together, and all the variables
-1y+6.4=0
We move all terms containing y to the left, all other terms to the right
-y=-6.4
y=-6.4/-1
y=6+0.4/1
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