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225=x*0.8
We move all terms to the left:
225-(x*0.8)=0
We add all the numbers together, and all the variables
-(+x*0.8)+225=0
We get rid of parentheses
-x*0.8+225=0
Wy multiply elements
-0.8x+225=0
We move all terms containing x to the left, all other terms to the right
-0.8x=-225
x=-225/-0.8
x=281+0.2/0.8
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