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7(1.4)+2.5y=0.8
We move all terms to the left:
7(1.4)+2.5y-(0.8)=0
We add all the numbers together, and all the variables
2.5y+9=0
We move all terms containing y to the left, all other terms to the right
2.5y=-9
y=-9/2.5
y=-3+1/1.6666666666667
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