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5(-4.2+3v)-3.8=1-(3v-10.2
We move all terms to the left:
5(-4.2+3v)-3.8-(1-(3v-10.2)=0
We add all the numbers together, and all the variables
5(3v-4.2)-(1-(3v-10.2)-3.8=0
We multiply parentheses
15v-(1-(3v-10.2)-3.8-21=0
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