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0.4x-0.8(x-4)=1.3x-1.9
We move all terms to the left:
0.4x-0.8(x-4)-(1.3x-1.9)=0
We multiply parentheses
0.4x-0.8x-(1.3x-1.9)+3.2=0
We get rid of parentheses
0.4x-0.8x-1.3x+1.9+3.2=0
We add all the numbers together, and all the variables
-1.7x+5.1=0
We move all terms containing x to the left, all other terms to the right
-1.7x=-5.1
x=-5.1/-1.7
x=+3
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