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15=9.5*0.4x
We move all terms to the left:
15-(9.5*0.4x)=0
We add all the numbers together, and all the variables
-(+9.5*0.4x)+15=0
We get rid of parentheses
-9.5*0.4x+15=0
We move all terms containing x to the left, all other terms to the right
-9.5*0.4x=-15
x=-15/1
x=-15
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