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4.5-x=-6.9
We move all terms to the left:
4.5-x-(-6.9)=0
We add all the numbers together, and all the variables
-1x+11.4=0
We move all terms containing x to the left, all other terms to the right
-x=-11.4
x=-11.4/-1
x=11+0.4/1
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