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8.9=x+4.5
We move all terms to the left:
8.9-(x+4.5)=0
We get rid of parentheses
-x-4.5+8.9=0
We add all the numbers together, and all the variables
-1x+4.4=0
We move all terms containing x to the left, all other terms to the right
-x=-4.4
x=-4.4/-1
x=4+0.4/1
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