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6y-3y-15=15.21
We move all terms to the left:
6y-3y-15-(15.21)=0
We add all the numbers together, and all the variables
3y-30.21=0
We move all terms containing y to the left, all other terms to the right
3y=30.21
y=30.21/3
y=10+0.21/3
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