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1.41=-2.1v
We move all terms to the left:
1.41-(-2.1v)=0
We get rid of parentheses
2.1v+1.41=0
We move all terms containing v to the left, all other terms to the right
2.1v=-1.41
v=-1.41/2.1
v=-1/1.48936170213
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