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15.1-0.3x=1.3x-4.2
We move all terms to the left:
15.1-0.3x-(1.3x-4.2)=0
We get rid of parentheses
-0.3x-1.3x+4.2+15.1=0
We add all the numbers together, and all the variables
-1.6x+19.3=0
We move all terms containing x to the left, all other terms to the right
-1.6x=-19.3
x=-19.3/-1.6
x=12+0.1/1.6
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