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-0.4(3x-4)=0.4x+12.5
We move all terms to the left:
-0.4(3x-4)-(0.4x+12.5)=0
We multiply parentheses
-1.2x-(0.4x+12.5)+1.6=0
We get rid of parentheses
-1.2x-0.4x-12.5+1.6=0
We add all the numbers together, and all the variables
-1.6x-10.9=0
We move all terms containing x to the left, all other terms to the right
-1.6x=10.9
x=10.9/-1.6
x=-6+1/1.2307692307692
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