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-2.5x+15.6=-7.5
We move all terms to the left:
-2.5x+15.6-(-7.5)=0
We add all the numbers together, and all the variables
-2.5x+23.1=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-23.1
x=-23.1/-2.5
x=9+0.6/2.5
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