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x+4.2=10.5x=
We move all terms to the left:
x+4.2-(10.5x)=0
We add all the numbers together, and all the variables
x-(+10.5x)+4.2=0
We get rid of parentheses
x-10.5x+4.2=0
We add all the numbers together, and all the variables
-9.5x+4.2=0
We move all terms containing x to the left, all other terms to the right
-9.5x=-4.2
x=-4.2/-9.5
x=3.5/7.9166666666667
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