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5.1=3x-4.2
We move all terms to the left:
5.1-(3x-4.2)=0
We get rid of parentheses
-3x+4.2+5.1=0
We add all the numbers together, and all the variables
-3x+9.3=0
We move all terms containing x to the left, all other terms to the right
-3x=-9.3
x=-9.3/-3
x=3+0.3/3
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