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0.3(10x+19)=3.1(0.2x
We move all terms to the left:
0.3(10x+19)-(3.1(0.2x)=0
We add all the numbers together, and all the variables
0.3(10x+19)-(3.1(+0.2x)=0
We multiply parentheses
3x-(3.1(+0.2x)+5.7=0
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