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1.5v-0.9v+2.1=4
We move all terms to the left:
1.5v-0.9v+2.1-(4)=0
We add all the numbers together, and all the variables
0.6v-1.9=0
We move all terms containing v to the left, all other terms to the right
0.6v=1.9
v=1.9/0.6
v=3+0.1/0.6
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