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-4x=x-2.5
We move all terms to the left:
-4x-(x-2.5)=0
We get rid of parentheses
-4x-x+2.5=0
We add all the numbers together, and all the variables
-5x+2.5=0
We move all terms containing x to the left, all other terms to the right
-5x=-2.5
x=-2.5/-5
x=2.5/5
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