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7y-3y-9=51.20
We move all terms to the left:
7y-3y-9-(51.20)=0
We add all the numbers together, and all the variables
7y-3y-9-(51.2)=0
We add all the numbers together, and all the variables
4y-60.2=0
We move all terms containing y to the left, all other terms to the right
4y=60.2
y=60.2/4
y=15+0.2/4
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