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0.4x-0.20(40+x)=0.05(40)
We move all terms to the left:
0.4x-0.20(40+x)-(0.05(40))=0
We add all the numbers together, and all the variables
0.4x-0.20(x+40)-(0.054)=0
We add all the numbers together, and all the variables
0.4x-0.20(x+40)-0.054=0
We multiply parentheses
0.4x-0.2x-8-0.054=0
We add all the numbers together, and all the variables
0.2x-8.054=0
We move all terms containing x to the left, all other terms to the right
0.2x=8.054
x=8.054/0.2
x=40+0.054/0.2
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