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-2.1y=10.5
We move all terms to the left:
-2.1y-(10.5)=0
We add all the numbers together, and all the variables
-2.1y-10.5=0
We move all terms containing y to the left, all other terms to the right
-2.1y=10.5
y=10.5/-2.1
y=-5
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