3x+1.2=4.2
3x+1.2=4.2-1.2 Here you are cancelling 1.2 by subtracting it from the other side of the =
3x=3
3x/3=3/3 Here you divide 3x by 3 to cancel the 3 and isolate the variable. you do the same on the other side.
x=1.
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