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15=0.004x.
We move all terms to the left:
15-(0.004x.)=0
We add all the numbers together, and all the variables
-(+0.004x.)+15=0
We get rid of parentheses
-0.004x.+15=0
We move all terms containing x to the left, all other terms to the right
-0.004x.=-15
x=-15/1
x=-15
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