if you have a variable in a fraction and want it by itself you have to rearrange the equation e.g.
2x/1=1
to get the variable by itself you first need to get rid of the fraction SO... you multiply both sides by the denominator (in this case it's 1) so you end up with 2x=1
to get the variable alone you then need to get rid of the coefficient, which in this case is 2. To get rid of this coefficient you need to divide both sides by two (because the variable is multiplied by 2) so then you end up with
2x/2=1/2
We can then simplify to x=1/2.
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