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5.1=x+7.8
We move all terms to the left:
5.1-(x+7.8)=0
We get rid of parentheses
-x-7.8+5.1=0
We add all the numbers together, and all the variables
-1x-2.7=0
We move all terms containing x to the left, all other terms to the right
-x=2.7
x=2.7/-1
x=-2+0.7/1
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