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0.4x-09x-5=20
We move all terms to the left:
0.4x-09x-5-(20)=0
We add all the numbers together, and all the variables
-8.6x-25=0
We move all terms containing x to the left, all other terms to the right
-8.6x=25
x=25/-8.6
x=-2+4.33333333333/4.77777777778
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