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13.3+y/7=4.2
We move all terms to the left:
13.3+y/7-(4.2)=0
We add all the numbers together, and all the variables
y/7+9.1=0
We multiply all the terms by the denominator
y+(9.1)*7=0
We add all the numbers together, and all the variables
y+63.7=0
We move all terms containing y to the left, all other terms to the right
y=-63.7
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