Question 1202508
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Assuming the equation you wrote is {{{15 - x/3 = 20}}}, then you are correct so far.


Let's solve for x.
We follow PEMDAS in reverse to undo what happens to x. This is to isolate it.
{{{15 - x/3 = 20}}}


{{{- x/3 = 20-15}}}


{{{- x/3 = 5}}}


{{{x = -3*5}}}


{{{x = -15}}}


Check:
{{{15 - x/3 = 20}}}


{{{15 - (-15)/3 = 20}}}


{{{15 - (-5) = 20}}}


{{{15 +5 = 20}}}


{{{20 = 20}}}
The solution works.
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