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5.1+y/7=-12.4
We move all terms to the left:
5.1+y/7-(-12.4)=0
We add all the numbers together, and all the variables
y/7+17.5=0
We multiply all the terms by the denominator
y+(17.5)*7=0
We add all the numbers together, and all the variables
y+122.5=0
We move all terms containing y to the left, all other terms to the right
y=-122.5
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