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0.4x-0.8(x-4)=13x-1.9
We move all terms to the left:
0.4x-0.8(x-4)-(13x-1.9)=0
We multiply parentheses
0.4x-0.8x-(13x-1.9)+3.2=0
We get rid of parentheses
0.4x-0.8x-13x+1.9+3.2=0
We add all the numbers together, and all the variables
-13.4x+5.1=0
We move all terms containing x to the left, all other terms to the right
-13.4x=-5.1
x=-5.1/-13.4
x=4.63636363636/12.1818181818
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