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23.4=7.8x
We move all terms to the left:
23.4-(7.8x)=0
We add all the numbers together, and all the variables
-(+7.8x)+23.4=0
We get rid of parentheses
-7.8x+23.4=0
We move all terms containing x to the left, all other terms to the right
-7.8x=-23.4
x=-23.4/-7.8
x=+3
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