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2.9=y-6.4
We move all terms to the left:
2.9-(y-6.4)=0
We get rid of parentheses
-y+6.4+2.9=0
We add all the numbers together, and all the variables
-1y+9.3=0
We move all terms containing y to the left, all other terms to the right
-y=-9.3
y=-9.3/-1
y=9+0.3/1
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