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2*13+y=27.50
We move all terms to the left:
2*13+y-(27.50)=0
We add all the numbers together, and all the variables
y+2*13-(27.5)=0
We add all the numbers together, and all the variables
y-1.5=0
We move all terms containing y to the left, all other terms to the right
y=1.5
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