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4+2.50y=21.50
We move all terms to the left:
4+2.50y-(21.50)=0
We add all the numbers together, and all the variables
2.50y+4-(21.5)=0
We add all the numbers together, and all the variables
2.50y-17.5=0
We move all terms containing y to the left, all other terms to the right
2.50y=17.5
y=17.5/2.50
y=7
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