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12.3y=-8.4
We move all terms to the left:
12.3y-(-8.4)=0
We add all the numbers together, and all the variables
12.3y+8.4=0
We move all terms containing y to the left, all other terms to the right
12.3y=-8.4
y=-8.4/12.3
y=-1.90909090909/2.79545454545
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