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21.48-6y+4y=18.90
We move all terms to the left:
21.48-6y+4y-(18.90)=0
We add all the numbers together, and all the variables
-6y+4y+21.48-(18.9)=0
We add all the numbers together, and all the variables
-2y+2.58=0
We move all terms containing y to the left, all other terms to the right
-2y=-2.58
y=-2.58/-2
y=1+0.58/2
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