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15=9.5+0.0004x
We move all terms to the left:
15-(9.5+0.0004x)=0
We add all the numbers together, and all the variables
-(0.0004x+9.5)+15=0
We get rid of parentheses
-0.0004x-9.5+15=0
We add all the numbers together, and all the variables
-0.0004x+5.5=0
We move all terms containing x to the left, all other terms to the right
-0.0004x=-5.5
x=-5.5/-0.0004
x=+13750
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