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0.4x+15.4=x-9.08
We move all terms to the left:
0.4x+15.4-(x-9.08)=0
We get rid of parentheses
0.4x-x+9.08+15.4=0
We add all the numbers together, and all the variables
-0.6x+24.48=0
We move all terms containing x to the left, all other terms to the right
-0.6x=-24.48
x=-24.48/-0.6
x=40+0.48/0.6
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