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-15=0.2x
We move all terms to the left:
-15-(0.2x)=0
We add all the numbers together, and all the variables
-(+0.2x)-15=0
We get rid of parentheses
-0.2x-15=0
We move all terms containing x to the left, all other terms to the right
-0.2x=15
x=15/-0.2
x=-75
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