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-0.7y=-2.1
We move all terms to the left:
-0.7y-(-2.1)=0
We add all the numbers together, and all the variables
-0.7y+2.1=0
We move all terms containing y to the left, all other terms to the right
-0.7y=-2.1
y=-2.1/-0.7
y=3+4.4408920985006E-16/0.7
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