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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
-(0.4x+9.5)+15=0
We get rid of parentheses
-0.4x-9.5+15=0
We add all the numbers together, and all the variables
-0.4x+5.5=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-5.5
x=-5.5/-0.4
x=13+0.3/0.4
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