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2y+7.8=16.4
We move all terms to the left:
2y+7.8-(16.4)=0
We add all the numbers together, and all the variables
2y-8.6=0
We move all terms containing y to the left, all other terms to the right
2y=8.6
y=8.6/2
y=4+0.6/2
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