4.2v+.8v=54

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Solution for 4.2v+.8v=54 equation: 



4.2v+.8v=54

We move all terms to the left:

4.2v+.8v-(54)=0

We add all the numbers together, and all the variables

5v-54=0

We move all terms containing v to the left, all other terms to the right

5v=54

v=54/5

v=10+4/5

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