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-2.1=x/5+10.4
We move all terms to the left:
-2.1-(x/5+10.4)=0
We get rid of parentheses
-x/5-10.4-2.1=0
We multiply all the terms by the denominator
-x-(10.4)*5-(2.1)*5=0
We add all the numbers together, and all the variables
-1x-62.5=0
We move all terms containing x to the left, all other terms to the right
-x=62.5
x=62.5/-1
x=-62+0.5/1
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