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2.5=x/2.8
We move all terms to the left:
2.5-(x/2.8)=0
We add all the numbers together, and all the variables
-(+x/2.8)+2.5=0
We get rid of parentheses
-x/2.8+2.5=0
We multiply all the terms by the denominator
-x+(2.5)*2.8=0
We add all the numbers together, and all the variables
-1x+7=0
We move all terms containing x to the left, all other terms to the right
-x=-7
x=-7/-1
x=+7
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