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-4=6.4+y
We move all terms to the left:
-4-(6.4+y)=0
We add all the numbers together, and all the variables
-(y+6.4)-4=0
We get rid of parentheses
-y-6.4-4=0
We add all the numbers together, and all the variables
-1y-10.4=0
We move all terms containing y to the left, all other terms to the right
-y=10.4
y=10.4/-1
y=-10+0.4/1
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